A new study from ABI Research suggests Orange's recent investment in High Definition voice services is the beginning of a HD voice boom. Its Mobile HD Voice report says today's "virtually nonexistent" market will grow dramatically from 2013, with about 487 million mobile subscribers using HD-enabled handsets on compatible networks in 2015.

Telecoms research company Berg Insight expects the number of mobile banking users to grow from 55 million people last year to reach 894 million users in 2015. That's a compound annual growth rate of 59.2%. Asia-Pacific is expected to account for more than half of the total user base, with 115 million users in Europe anticipated by 2015.

Mobile research company Ground Truth has published a survey that shows more than half of the time spent on the mobile internet is spent on social networking sites. The US-based research said that 59.8% of online time was spent on social networking sites. Portals took 13.7% of consumers' time, operator sites took 9%, messaging 7.4% and downloads 1.3%.

Mobile-focussed sites airG, MocoSpace and mbuzzy were all visited for an average of over one hour per week.

A new study has been launched today to investigate whether there is a link between the use of mobile phones and long-term health problems such as cancer. It's called the cohort study on mobile communications (COSMOS) and forms part of the Mobile Telecommunications and Health Research Programme, which is funded by government and industry.

COSMOS participants will be from the UK, Denmark, Sweden, Finland and the Netherlands. The study will run for 20-30 years and will follow the health of at least a quarter of a million participants aged 18-69. The UK arm of COSMOS is being led by a research team from Imperial College London.