Telefonica's acquisition of voice over IP service Jajah in 2010 has led to the launch of O2's latest product: an International Calling Card.

The company says it's cleaning up what it describes as a "scammy" market by offering competitive charges from just 1p per minute.

Deutsche Telekom and France Telecom - which already work in partnership as Everything Everywhere and recently announced plans to cooperate in other business areas - are now going shopping together.

They've agreed to combine their procurement activities for customer equipment, network equipment, service platforms and IT Infrastructure.

The Indian government is asking the country's mobile networks not to support Nokia's new email service without implementing a monitoring system. It's previously asked RIM to provide a similar option for BlackBerry email users.

Nokia's new 'push' email service enables users with compatible phones to retrieve their messages from a variety of email providers.

Mark Bridge writes:

We started this week with a story that grabbed plenty of attention. It was a report from Billmonitor.com that claimed we in the UK were wasting almost £5 billion every year by choosing the wrong mobile tariffs. Although I remained a little cynical about some of the detail, there's no doubt that many consumers could be better off if they switched tariff - or even network.

O2 UK has announced the expansion of its in-store 'Guru' technical help service to the internet. O2 Guru TV is a YouTube video channel offering advice that helps customers get the most from their mobile technology.

The free service is open to everyone and currently includes over 400 videos, with over 50 new videos being added every month.