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Martin Lewis has advised anyone with a mobile phone to input their address into a website to instantly determine if their provider offers the best signal. Those using EE, Vodafone, Three, O2, and vendors that utilise these networks such as Tesco , Giffgaff, and Sky have been encouraged to check - and potentially switch.

During his Money Show Live this week on ITV , Mr Lewis stated: "Mobile - which network's got the strongest signal indoors and out where you live? I actually really rate the Map Your Mobile tool on Ofcom.org.uk. It's detailed, well worth checking to see where you get the best signal.

"By the way do feed back to them if you feel it's wrong - there's a button underneath."

Following his advice, Martin revealed that he understood the website crashed: " I'm bei

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