In this week's podcast we talk about two of the big announcements from Google I/O: a new version of Android and the retail launch of smartwatches powered by 'Android Wear'.

We also talk about Android-based smartphones from Nokia and Blackphone, network complaints in the UK, a reduction in European roaming charges and mobile ticketing.

Messaging was very much on the agenda at Mobile World Congress this year, following Facebook's announcement that it was planning to acquire WhatsApp in a 19 billion dollar deal. So if the future for this type of internet-based 'over the top' messaging service looks good, what does this mean for SMS?

To find out more, we spoke to Stacy Adams of mBlox to learn what was happening in the messaging world, to find out how SMS is being integrated with mobile apps - and to discover some of the other ways SMS was being used by businesses today.

Today's podcast starts with a gentle warning to app developers from the Office of Fair Trading.

We then move on to Amazon's new tablets, HTC's sale of its Beats Electronics stake, Twitter's emergency alerts, UK government plans to improve mobile broadband on trains, customer complaints and the growth in adult content for mobile devices.

We start this week's edition of The Fonecast with confirmation that 4G coverage will be launched in the UK this year, thanks to Everything Everywhere.

However, all's not well in the world of mobile retail - as mystery shopping by a consumer organisation reports widespread misinformation from sales staff.

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.