TalkTalk launches Britain's cheapest smartphone deal

A new mobile deal has been launched which promises to be the cheapest ever. Let's see how TalkTalk's move into mobile phones compares to the rest of the market.

Smartphones are expensive and for most top-of-the range models, even if you manage to secure a good-value deal, you'll probably have to cough up for the phone or lock yourself into at least a two-year contract.