Microsoft has warned that Windows Phone handsets which have previously been 'updated' using an unofficial process may not be able to receive any further updates.

People who managed to 'force' version 7390 onto their phones instead of waiting for an update via their Zune PC software won’t be able to receive version 7392… or any further OS revisions.

Application store analyst company Distimo says Google's Android Market has overtaken the Apple App Store when it comes to free applications. It's calculated that Android currently has 134,342 free applications while the Apple App Store has 121,845 free applications for iPhones.

Distimo says the Android Market will become the world's largest app store (in terms of the number of applications) in around five months if all application stores maintain their current growth rate.

In this week's edition of The Fonecast we're talking about privacy on iPhones, Nokia's smartphone plans, phoning via Facebook, legal battles and complaints to Ofcom.

We also prepare for our forthcoming 250th podcast by turning the clock back to 2007, when we discussed the 'cashback crisis' that had hit a number of mobile retailers.

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.

Nokia and Microsoft have signed their partnership agreement today. The planned partnership was first announced in February.

The two companies say they've made "significant progress" on the development of the first Nokia products incorporating the Windows Phone platform. Nokia has also started porting key applications and services to operate on Windows Phone.