It's a good week for Yahoo! as it appoints Marissa Mayer - previously Google employee number 20 - to the role of CEO. However, things aren't as cheery at Research In Motion, which has been ordered to pay over $147 million in a patent case.

Meanwhile O2 UK is recovering from a network problem that left around a third of its customers disconnected for almost a day.

There's plenty of variety in The Fonecast this week. We start the podcast with news of MeeGo's resurrection by Finnish smartphone company Jolla before talking about a mobile network that’s giving away mobile data whenever its customers watch video advertisements.

There's also time to discuss Telefonica's recent deals, the rise of free WiFi availability, tablet-related legal action, malware in the Apple App Store and the truth behind a recent 'exploding mobile phone' story.

In this special feature we're talking to Ian Brown from Axell Wireless about mobile phone coverage on the London Underground.

WiFi is now available on a number of London Underground stations - so why is it taking so long to arrange mobile phone service on the Tube?

This week's edition of The Fonecast takes a look at the new Google Nexus 7 tablet, wonders what's next for RIM and awaits the arrival of the forthcoming Firefox mobile platform.

There's also talk about HTC's partnership with Pioneer, Vodafone's European reorganisation, the new BT WiFi brand, Ofcom complaints, tariff problems and international roaming.

In this week's podcast we're talking about the forthcoming Windows Phone 8 mobile operating system, the UK launch of the Amazon Appstore and the GSMA's plans to make international roaming easier to understand.

There's also time to discuss new mobile tariffs from Virgin Media, cars that call for help after an accident, some mobile shopping research and LG's future as a tablet manufacturer.