Media playback is unsupported on your device

Why does my phone think it is abroad?

4 April 2014 Last updated at 22:02 BST

It is known as "inadvertent roaming", and it means that your mobile phone behaves as if it is abroad.

The phenomenon affects mobile customers in the south of England, who are picking up French network signals - as well as other parts of the UK.

Zoe Kleinman reports.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.