Although more and more people are signing up to contract mobile phone deals, pay as you go (PAYG) remains a popular type of mobile subscription.
The flexibility and convenience of these deals can offer a number of advantages to customers.
A PAYG deal means you only pay for the calls and texts you use and you also have the freedom to change or end your deal at any time.
Because of this, PAYG deals are particularly useful for people who don't make many calls or who only want to use their phone on the odd occasion.
For example, some people keep a PAYG mobile in their car in case of a breakdown, or give them to an older relative or a child so they can get in touch in an emergency.
But did you know that if you don't use your PAYG phone at least once every few months, when you do go to use it you could be left without a signal.
That's because if a PAYG phone number is not being used, the mobile operator can suspend the service and recycle the number. Mobile companies do this to ensure that the numbers they have are being used efficiently.
The length of time that a mobile provider deems a phone inactive varies by provider - for some it can be as little as 70 days, while others wait six months or longer.
If you're concerned that your PAYG phone might be suspended because you don't use it enough, contact your provider and find out: