Iain, James and Mark look at the week's mobile news headlines, from Ofcom cutting termination rates to Opera launching its own application store... and they also hear how an unusual ringtone resulted in a criminal gang being apprehended.

A new research report from Berg Insight has calculated that worldwide shipments of smartphones increased 74% last year to 295 million units. The number of smartphone users increased by 38% year-on-year to an estimated 470 million people.

Shipment volumes are expected to continue increasing at a compound annual growth rate of 32.4%, reaching 1.2 billion units in 2015.

In this week's podcast we discuss the iPad 2, data restrictions, mobile radio, mobile viruses and mobile tickets. In addition, Leslie Ferry of Broadsoft talks about IP communications... and Iain Graham raps. Yes, really.

A new report from Juniper Research says the worldwide Mobile Entertainment market was worth $33 billion last year, with this figure expected to reach $54 billion in 2015. It says the rise will be driven by smartphone adoption and an increase consumer-oriented application downloads.

The combination of app stores and smartphones are described as having created 'an unprecedented level of awareness and usage of services' including social media, games, video and streamed music.

Acer - currently claiming the world no.2 spot for PC and notebook sales - has revealed new tablet devices and a new smartphone this week.

The Acer ICONIA SMART promises a 4.8-inch 1024x480 widescreen and an 8-megapixel camera. The device will run Android 2.3 Gingerbread on a Qualcomm 1GHz processor. UK availability is expected from May 2011.