This week's podcast takes a look at Everything Everywhere's departing CEO, Vodafone's security concerns, ZTE's own-brand phones, HTC's legal worries and Sony Ericsson's results. As usual, the programme is hosted by Iain Graham with James Rosewell and Mark Bridge.

Arriva UK Bus, part of the Arriva Group owned by Deutsche Bahn, says it's now issued mobile tickets for more than one million bus journeys.

The company's m-ticketing service was introduced 18 months ago and currently has 40,000 registered users.

Last month Juniper Research said the number of mobile phone users making payments for digital goods was expected to reach 2.5 billion worldwide by 2015, a 40% increase from this year's forecast of 1.8 billion.

It's now published a new study that looks at all mobile money transactions. The company says the total value of mobile payments for digital and physical goods, money transfers and NFC transactions will reach $670 billion by 2015.

A new report from Juniper Research anticipates the number of mobile phone users making payments for digital goods reaching 2.5 billion worldwide by 2015. That's a 40% increase from this year’s forecast of 1.8 billion.

Key growth sectors are expected to include mobile tickets for transport and entertainment.

Chiltern Railways has launched a mobile ticketing system that enables passengers to use their mobile phone for buying, receiving and validating train tickets.

It's believed to be the first time that rail passengers have been able to use any mobile phone to buy and receive rail tickets in a single transaction. Passengers can use their phone to buy a ticket and to pass through the barrier.