Mark Bridge writes:

We started this week with a story that grabbed plenty of attention. It was a report from Billmonitor.com that claimed we in the UK were wasting almost £5 billion every year by choosing the wrong mobile tariffs. Although I remained a little cynical about some of the detail, there's no doubt that many consumers could be better off if they switched tariff - or even network.

Mark Bridge writes:

Oh, those nasty mobile networks. They're robbing us blind… at least, that's what you might think if you've been reading the headlines this week.

Mobile users 'overpaying by £200', said the BBC. £5bn 'wasted' on mobile phone bills, said the Financial Times. It's the wrong tariff, Gromit!, said Telecom TV after hitting the Wensleydale.

In this week's edition of The Fonecast we're chatting to David Emm, senior security researcher at Kaspersky Lab UK, about the security threats facing mobile phone users.

We also discuss the latest report from mobile tariff comparison site Billmonitor, we talk about Tuesday's Symbian news, we look at a new unlimited internet deal and we discover a clutch of MVNOs.

The Billmonitor.com price comparison website says over three-quarters of UK mobile phone customers are on the wrong mobile tariffs, which is costing those people almost £5 million annually. It's analysed over 28,000 mobile phone bills and has compared than against over 8.5 million tariff options from O2, Orange, Vodafone and T-Mobile.

Billmonitor's calculations show that those 76% of UK mobile customers on the wrong tariffs are wasting an average of £194.71 each per year.

Mark Bridge writes:

We head into the weekend with the News of the World admitting voicemail hacking was more widespread than previously thought. Mobile networks had already made it much harder to access voicemail remotely… and now the NotW is saying sorry and preparing to pay compensation.