GADGET fans must look out for the warning signs of a hacked account.
Cyber-experts have revealed the "red flags" that could reveal if your iPhone or Android have been compromised.
It's more important than ever to be able to spot a hack attack.
"Whether it's your email, a social media account, or your online bank, losing access to a digital account can be stressful," the UK's National Cyber Security Centre (NCSC) warned.
There are five key "red flags" to look out for, according to the NCSC.
Millions of Android owners could slash 'vampire bills' – how to save money
And they all involve checking to see if there has been any unauthorised activity on your account.
The first is being unable to log in to your accounts.
This is often one of the first signs of a hack attack.
As soon as this happens, head to your emails and try to change your password.
Second is spotting any changes to your security settings.
This might not be obvious, so make sure to check regularly so you're as familiar as possible with them.
Third is noticing messages or notifications sent from your account that you don't recognise.
Your friends or family may be able to alert you if they notice any suspicious texts coming from your accounts.
Fourthly, look for logins (or attempted logins) from strange locations, or at unusual times.
Millions of iPhone and Android phone owners must check settings immediately
Apps (including Facebook) often let you view this information in settings
Fifth and finally, keep an eye out for unauthorised money transfers or purchases from your online accounts.
This may mean hackers have hijacked your bank account or another shopping system, which is very serious. You should take immediate action.
If your account has been hacked, check your emails, change your passwords, and log out everywhere.
Make sure you have two-step authentication set up, so a text message or code is required for logins.
And ensure your devices are all up-to-date.
"In some cases, it may not be possible to recover your account with the online service," the NCSC explained.
"In such cases, you'll have to create a new account, if you want to continue using the service.
"Once you've done this, it's important to give contacts your new details, and tell them you've abandoned the old account.
"Make sure to update any bank, utility or shopping websites with your new details."
We pay for your stories! Do you have a story for The Sun Online Tech & Science team? Email us at tech@the-sun.co.uk
