This week's news stories include claims of spying iPhones, Nokia's plans, Facebook chat, Sony's tablets, Ofcom complaints, legal action and Charlie Sheen. We also look back at the 'cashback crisis' of 2007.

Two new calling services for Facebook's voice chat feature have been announced today by mobile network operators.

In the USA, T-Mobile has created a new brand called Bobsled and a PC-based application for Facebook. It enables any Facebook users to call their Facebook friends free from a PC and to send voice messages to their friends. And here in the UK, virtual network giffgaff has created a free Facebook chat app for the iPhone.

This week's edition of The Fonecast starts with an Olympic theme.

We talk about mobile phone coverage at the London 2012 games - and then move on to mobile payments for Olympic visitors. In the middle of the show you'll find a handful of takeovers, Facebook's website and some wireless patents… before we end with a newspaper being fooled by a ghostly iPhone application.

Facebook is upgrading its mobile website - m.facebook.com - so that it identifies the type of device visiting the site. It means the company will no longer need multiple versions of the site, including touch.facebook.com, and will be able to add extra functionality for compatible devices.

The same improvements will also be available on 0.facebook.com.

Facebook has made a deal to acquire Snaptu, a London-based mobile application developer with a focus on 'non-smart' handsets.

The two companies co-operated earlier this year on the Facebook for Feature Phones app, which works on more than 2,500 devices.