While not all nuisance calls are scams or associated with fraud, many are. There are several types of scams or fraudulent calls you might receive on your phone. These include:

• Caller ID Spoofing
  At this kind of call the caller changes the number from which he is calling you. Normally, if someone calls you the device captures and shows you the phone number of the caller. But, scammers try to fool you by changing the number that you see on your phone.
  
  Those that try to scam you often pretend to be a reputable company or perhaps a company or organization that you already trust, like your bank. They are doing this to steal your personal information and possibly try to gain access to your bank account or other financial accounts. Alternatively, they may be looking for personally identifiable information for stealing your identity.
  
  When such scammers are calling you, they may even say that they’re from your financial institution and that they need to collect or verify some of your information. They may claim this is part of a security check or that your personal information may have been compromised. Don’t give them any information over the phone. Your bank, brokerage firm or other financial institutions will not call you and ask you for about your personal information like your bank account number.
  
  Never rely on the caller ID alone to determine whether the person is really from the organisation he claims to be. If you suspect the person might be trying to defraud you or if you can’t verify that the person called you is from your bank/financial institution, hang up, notify your bank/financial institution or the police.
  
  Before you dial out to another number be sure that the previous call has been terminated. If you are unsure about this take another phone for your next dial out. If the scammer did not clear the line by hanging up, then there is a chance that when you attempt to make the next call and you end up by talking to the scammer again. For the case that they called you at your fixed line, they may even are able to play a ringtone to make it sound like you are making a dial while they are waiting patiently and silently on the other side. So make sure your line is clear when calling your financial institution to verify the call, that way, you do not accidentally reconnect with the fraudster or an accomplice. Use always phone numbers that have been provided to you by the companies you deal with and not a phone number told you over the phone.
  
  
• Spam Texts
  Spam text messaging occurs when a company or organization sends you an unwanted text message alerting you about something or sending you an offer.
  
  In general, it’s illegal for anyone or any company to send you spam texts unless you’ve already asked them to send you text messages. If you’ve given to a business the permission to text you, however, that company can continue to send you texts for other services, but it must offer you the option to opt out.
  
  
• Overt Abusive Calls
  When someone rings you at your fixed line and is abusive, whether it’s a stranger, a company you’re doing business with, or some other organization, you should immediately call your phone company and ask to speak with their nuisance or malicious calls team. Notify them of the problem, and they may offer you anonymous call blocking.
  
  At mobile phones are you normally able to setup anonymous call blocking and blocking of single phone numbers by yourself. Consult the instruction manual of your mobile phone for more information how to block phone numbers and anonymous calls.
  
  But, be aware that the service can also block legitimate calls you receive. For example, if you receive regular phone calls from family or friends out of the country, anonymous call blocking might block these calls. If you opt for the service, you will also have to coordinate with your friends or family to make sure important calls get through or you may have to ring them yourself.
  
  
• Unsolicited Calls
  Calls you receive that you did not ask for and do not want
  
  Unsolicited calls are often marketing-related. A company or organization gets your phone number and starts calling you offering you products or services. Normally, a business must have your permission to ring you for an offer, but many businesses skirt these rules or find creative ways to get you to agree to have them ring you for offers.
  
  For example, if you sign up for, or purchase, anything online, you may be unknowingly agreeing to receive phone calls from solicitors.
  
  Sometimes, these calls are automated. So-called “robo-callers” or automated calling systems will ring you on a preset schedule. Sometimes, the solicitors are calling about donations to a charity. Other times, they are calling to sell you debt management services or legal services for personal injury claims. Still other times they are calling to sell you products over the phone.
  
  Marketing agencies and organizations making such calls must have your permission to call you, but if you’ve checked off any boxes online while filling out a form, or while making a purchase, or agreed to terms of service which allowed a business to sell your personal information, you may have already given permission accidentally.
  
  You may also get caught by something called “Automatic Number Identification” or ANI. These systems don’t get your permission explicitly, but rather implicitly. Once you dial out, it’s done. The organization captures your number and sells it to other companies who then call you.
  
  The best way to protect yourself is to not sign up for anything online, through the mail, and resist giving out your phone number unless you know who you’re giving it to and you can be assured that your information won’t be sold to anyone else.
  
  If you’re already on a list, call the Telephone Preference Service and ask to be opted out of receiving calls.
  
  
• Abandoned or Silent Calls
  Calls that are silent (you see them as missed calls) or are disconnected when you answer
  
  

People Who Are Most At Risk For Nuisance Calls

The Elderly

While anyone can be the victim of a nuisance call, some groups of people are especially vulnerable. For example, the elderly and single parents may receive an unusually high number of nuisance calls relative to the general population.

In fact, it is estimated that while the average UK resident receives 7 nuisance calls a month, 40% of the phone calls that older and vulnerable residents of Scotland receive are nuisance  calls.

These statistics were discovered by Angus Council, East Dunbartonshire and East Renfrewshire, three of the country’s trading standards authorities.

Additionally, the The Financial Ombudsman Service found that roughly 80% of individuals who were scammed out of their savings were over 55. About one in five was over 75.

About 38% of victims lost anywhere between £5,000 and £14,999, with 20% of victims losing between £20,000 and £49,999. Some unfortunate victims lost more than £100,000. The most at-risk areas include London and the South East.

The elderly are especially vulnerable to these nuisance calls. Malicious individuals or organisations often prey on them, attempting to get personal information or have the senior hand over his or her life savings.

Some firms try to entice elderly victims with prize winnings or send begging letters. Of course, there is no prize waiting for the victim.

Another scam promises the victim lottery winnings, usually from outside the state or country. And, the senior doesn’t even have to enter. In fact, these organisations contact victims, telling them that their name was drawn at random and they’ve won. Incredible! They didn’t even enter any contest.

The only stipulation is that the elderly victim pay some fee or administrative cost before the money is released. Elderly people tend to be inherently trusting, and so they hand over the cash, but never receive the prize winnings.

Yet another scam involves unlicensed financial advisors who attempt to sell seniors unregulated investments which may jeopardise their life savings. While the recent banning of commissions has eliminated many commission-driven fraudsters, the practice of cashing in a pension pot is still a problem for many.

Fortunately, up to 98% of these nuisance calls can be blocked using special call-blocking technology.

Single Parents

Single parents might also be a victim of nuisance calls, especially when there are children involved. An ex-partner may be jealous or feel that the relationship ended badly, and may call directly or put someone else up to ringing their spouse or ex-partner’s line repeatedly.

Vulnerable individuals need to report all fraudulent activity to the authorities, like Ofcom, immediately. If you suspect you have been, or are about to be, a victim of a crime, call the local police.

Blocking Calls Using Apps

Truecaller is an app for iOS devices that helps you peek behind the curtain of a phone number to learn who’s really behind the call. Get enhanced call ID information, search for any number to see who it belongs to, and link directly to Yelp! and other social networks to find the identity of the organisation making the call.

This app makes blocking spam and scammers much easier.

As with iPhone, Truecaller for Android can help you block unwanted calls on your Droid. Install the app and use it as you would on iPhone.

Best Practices For Staying Safe

Of course, beyond the apps and settings on your phone, there are some best practices you can employ to avoid being scammed or bothered by unwanted calls:

Stop signing up for free offers

Free offers are almost never free. When you tick off a box that says you agree to the terms and conditions, read them. Often, part of those terms includes a provision that lets the company sell your personal information. If you agree to these terms, you may start receiving phone calls which you believe are unsolicited.
Unfortunately, because you’ve agreed to terms and conditions which allow for this, there is usually no recourse other than asking to be removed from the organisation’s call list.

Resist paid offers unless you know and trust the business

Think before you buy into another service, even if it’s a contract renewal. Mobile phone renewals, for example, could trigger an avalanche of follow-up calls, asking you to sign up for additional services or buy additional products from the carrier or a dealer.

These calls can turn into nuisance calls that you can’t easily stop because you’ve already done business with the company and agreed to receive calls from them.

When a business asks you for your contact information before, during, or after a sale, resist it. Most businesses want your number so that they can call you in the future with offers. Unless you want sales calls in the future from a company, just politely decline. If the business or organisation insists, remind them that you are already doing business with them. If they refuse business unless you hand over your contact information, it may be a good idea to do business with someone else.

Don’t agree to anything over the phone if you’re unsure about the caller

Sometimes, it’s difficult to say “no” to someone over the phone, especially if they’re nice and polite. However, if you do not know the individual, your best response usually is “no.”

Do not give out your credit card numbers, don’t agree to switch utility providers, even if they promise you a lower tariff (always check with your provider first about your rates vs a competitors’). And, don’t assume a friendly inquiry or marketing survey is always innocent. Often, these calls are designed to trick you into buying something you don’t really want.

Do not use your real number

If you do have to sign up for a service, or you’re buying a product online, sign up for a Google number through Google Voice. This service lets you create a fictitious number which can be easily changed so you’re not giving out your real number. And, it’s easy to set up:

• Go to the Google Voice website and sign in with your Google Account login information
  
  
• Choose a Google Voice Account type
  
  
• Select “I want a new number”

• Enter a forwarding number and the type of phone you have. This is the phone that will ring when someone rings this new Google number. You can add more phones to this number later if you want
  
  
• Take down the code presented to you and click “Call Me Now” to verify your forwarding phone
  
  
• Enter the code you received previously into the box on the screen
  
  
• Search for an available Google Voice Number. You may search by area code, post code, word or phrase
  
  
• Select your number

That’s it. Your new number is now active. When you sign up for services, simply give organisations and businesses your Google number. When they ring it, it will forward the call to your real number.

If you start having problems with nuisance calls, simply get rid of the Google number and get another one. This effectively sets up a shield between you and the would-be nuisance caller.

Add your name to the 'do-not-call' list

The Telephone Preference Service lets you opt out of receiving calls from solicitors. While many individuals are familiar with this service for landlines, TPS will accept mobile phone numbers as well. It’s a good first line of defense.

It will not stop charity organisations, however, and some calls may get through if they are not considered telemarketing calls. These calls may still be considered nuisance calls. However, you should see a dramatic reduction in the number of them.

Authorities may not always be able to take action against scams, even if it seems like a scammer might have broken the law. Although it may be hard to recover any money that you have lost to a scam, there are steps you can take to reduce the damage and avoid becoming a target for a follow-up scam. The more quickly you act, as larger is your chance of reducing your losses. Report a scam. By reporting the scam to authorities, they may be able to warn other people about the scam and minimize the chances of the scam spreading further. You should also warn your friends and family of any scams that you come across.

If you have been tricked into signing a contract or buying a product or service

Contact your provincial or territorial consumer affairs office and consider getting independent advice to examine your options: there may be a cooling-off period or you may be able to negotiate a refund.

If you think someone has gained access to your online account, telephone banking account or credit card details

Call your financial institution immediately so they can suspend your account and limit the amount of money you lose. Credit card companies may also be able to perform a "charge back" (reverse the transaction) if they believe that your credit card was billed fraudulently. Do not use contact details that appear in emails or on websites that you are suspicious of - they will probably be fake and lead you to a scammer. You can find legitimate contact details in the phone book, an account statement or on the back of your ATM card. 

If the scam relates to your health

Stop taking any pills or substances that you are not sure about. See a doctor or other qualified medical professional as soon as you can. Be sure to tell them about the treatment that the scammer sold (take along any substances, including their packaging). Also tell them if you have stopped any treatment that you were taking before the scam.

If you have sent money to someone that you think may be a scammer

If you sent your credit card details, follow the instructions in the section opposite.

If you sent money through an electronic funds transfer (over the Internet), contact your financial institution immediately. If they have not already processed the transfer, they may be able to cancel it.

If you sent a cheque, contact your financial institution immediately. If the scammer hasn’t already cashed your cheque, they may be able to cancel it.

If you sent money through a wire service (such as Western Union or Money Gram), contact the wire service immediately.

If you are very quick, they may be able to stop the transfer.

If you have been tricked by a door-to-door seller

You may be protected by laws that provide you with a "cooling-off" period, during which you can cancel an agreement or contract that you signed. Contact your provincial or territorial consumer affairs office for advice about door-to-door sales laws.

If you have been scammed using your computer

If you were using your computer when you got scammed, it is possible that a virus or other malicious software is still on your computer. Run a full system check using reliable security software.

If you do not have security software (such as virus scanners and a firewall) installed on your computer, a computer professional can help you choose what you need.

Scammers may have also gained access to your online passwords. Change these using a secure computer.

If the scam involves your mobile phone

Call your telephone provider and let them know what has happened.

Mobile phone scams can be difficult to recognize. Be wary of somebody who talks as if they know you or of redialling a missed call from an unknown number - there may be hidden charges.

Ringtone scams might attract you with an offer of a free or low-cost ringtone. What you may not realize is that by accepting the offer, you may actually be subscribing to a service that will keep sending you ringtones - and charging you a premium rate for them. There are many legitimate companies selling ringtones, but there are also scammers who will try to hide the true cost of taking up the offer.

Scammers either don’t tell you that your request for the first ringtone is actually a subscription to a ringtone service, or it may be obscured in fine print related to the offer. They also make it difficult for you to stop the service. You have to actively "opt out" of the service to stop the ringtones and the associated charges.

Missed call scams start by scammers calling your phone and hanging up so quickly that you can’t answer the call in time. Your phone registers a missed call and you probably won’t recognize the number. You may be tempted to call the number to find out who called you. If it is a scam, you will be paying premium rates for the call without knowing.

Text message scams work in a similar way, but through a Short Message Service (SMS). Scammers send you a text message from a number you may not recognize, but it sounds like it is from a friend - for instance: "Hi, it’s John. I’m back! When are you free to catch up?" If you reply out of curiosity, you might be charged at premium rate for SMS messages (sometimes as much as $4 for each message sent and/or received).

An SMS contest or SMS trivia scam usually arrives as a text message or in an advertisement and encourages you to take part in a trivia contest for a great prize. All you need to do is answer a certain number of questions correctly. The scammers make money by charging extremely high rates for the messages you send and any further messages they send to you. With trivia scams, the first set of questions will be very easy. This is meant to encourage you to keep playing. However, the last one or two questions that you need to answer to claim your "prize" could be very difficult or impossible to answer correctly.

Protect yourself:

• Text "STOP" to end unwanted text messages or to end unwanted subscriptions.
  
  
• Never reply to text messages offering you free ringtones or missed calls from numbers that you do not recognize.
  
  
• Don’t call or text phone numbers with are beginning with the well-known digits of premium phone numbers unless you are aware of the cost involved and carefully read any terms and conditions when texting short codes.
  
  
• Read all the terms and conditions of an offer very carefully. Services offering free or very cheap products often have hidden costs.
  
  
• Ask yourself if you know how to stop any subscription service I want to sign up to?

Identity theft occurs when someone assumes your identity to perform a fraud or other criminal act. Criminals can get the information they need to assume your identity from a variety of sources, including by stealing your wallet, rifling through your trash, or by compromising your credit or bank information. They may approach you in person, by telephone, or on the Internet and ask you for the information.

Identity fraud can be described as the use of that stolen identity in criminal activity to obtain goods or services by deception.

Fraudsters can use your identity details to: 

• Open bank accounts.
• Obtain credit cards, loans and state benefits.
• Order goods in your name.
• Take over your existing accounts.
• Take out mobile phone contracts.
• Obtain genuine documents such as passports and driving licences in your name.
• Stealing an individual’s identity details does not, on its own, constitute identity fraud. But using that identity for any of the above activities does. 

The first you know of it may be when you receive bills or invoices for things you haven’t ordered, or when you receive letters from debt collectors for debts that aren’t yours.

The sources of information about you are so numerous that you cannot prevent the theft of your identity. But you can minimize your risk of loss by following a few simple hints.

Tips for Avoiding Identity Theft:

• Never throw away ATM receipts, credit statements, credit cards, or bank statements in a usable form.
  
  
• Never give your credit card number over the telephone unless you make the call.
  
  
• If you receive an unsolicited email or phone call from what appears to be your bank or building society asking for your security details, never reveal your full password, login details or account numbers. Be aware that a bank will never ask for your PIN or for a whole security number or password.
  
  
• Reconcile your bank account monthly, and notify your bank of discrepancies immediately.
  
  
• If you’re expecting a bank or credit card statement and it doesn’t arrive, tell your bank or credit card company.
  
  
• Keep a list of telephone numbers to call to report the loss or theft of your wallet, credit cards, etc.
  
  
• Report unauthorized financial transactions to your bank, credit card company, and the police as soon as you detect them.
  
  
• If you move house, ask your mail service to redirect your post for at least a year.
  
  
• Review a copy of your credit report at least once each year. Notify the credit bureau in writing of any questionable entries and follow through until they are explained or removed.
  
  
• If your identity has been assumed, ask the credit bureau to print a statement to that effect in your credit report.
  
  
• If you know of anyone who receives mail from credit card companies or banks in the names of others, report it to local or federal law enforcement authorities.