Samsung Electronics says its Android-powered Galaxy S4 smartphone has already sold 10 million units since sales began on 26th April, less than a month ago.

That’s the equivalent of four phones every second.

We start this week's podcast by talking about Yahoo and Tumblr before moving on to discuss Google's recent developer conference.

There are product announcements from BlackBerry, HP and the former MeeGo developers at Jolla... and there's some interesting mobile app news as well.

Mark Bridge writes:

Last year, the Google I/O developer conference gave us plenty of product announcements: Google Glass, the Nexus 7 tablet, the Nexus Q device and the Jelly Bean version of Android. This year’s announcements were less dramatic: a streaming music service, a Google-friendlier Galaxy S4 and some game development tools. Coincidentally (or perhaps not) Apple announced its 50 billionth app download in the middle of the event.

Mary Grant, who was CEO of the Phones 4U retail business, is reported to have left the company for ‘personal reasons’.

Mobile News reports that Phones 4U Group CEO Tim Whiting is temporarily taking on her role in addition to his own work.

We start today's programme with the promise of a faster roll-out for the UK's mobile broadband services.

Next on the agenda is tablet sales... followed by mobile security, mobile boarding passes, quarterly results, acquisitions, advertising and management succession.