A woman from Greenwich is warning others after a number of "scam" calls about "child porn".

Joanne Longland posted on a local Facebook group: "Be careful, just answered the phone for someone I care for claiming they were from Microsoft, saying there was child porn on there computer."

Nuisance calls are not a new thing but the people looking for your details are getting sneakier.

Joanne continued: "They were trying to get me to open their computer and to put in a password, saying if I didn't the police would be breaking down the doors.

Luckily Joanne was on the ball and knew this was a scam but others aren't always so lucky.

READ MORE: Eltham residents warned over fraudulent calls

A Microsoft spokeswoman told News Shopper: "Unfortunately, the names of reputable companies like Microsoft are often used fraudulently to lull victims into a false sense of security.

"Our customers are often targeted by criminals who are always seeking new and increasingly sophisticated ways to deceive their victims and we work closely with law enforcement to tackle these scams and protect our customers.

We’d like to reassure all users of our software that Microsoft will never cold call you out of the blue to offer tech support or send you unsolicited tech support pop ups. The best way to report these scams is to contact Action Fraud.”

In light of this here are a few ways to spot a scam:

The scammer will contact you out of the blue, a random phone call or email.

They will make promises that sound too good to be true and they 99% always are too good to be true.

They will ask you to pay up front.

They will try and get you to make a very quick decision

Be overly friendly and familiar with you

Tell you the offer is a secret

Ask for your bank account details - no legitimate company will EVER ask you this over the phone.

They will give you a mobile number or PO Box address.

Please stay vigilant when it comes to scam phone calls, emails and letters. It can be easy to think you are getting a good deal or get confused into making decisions, but we promise it will sting if your card is duplicated.