73% of mobile phone users in the USA use their mobile phones to visit social networking sites at least once a day, according to a new survey from ABI Research.

Social networking was the second most-popular mobile activity after checking email, which was carried out by 80% of smartphone, feature phone or tablet users.

Vodafone has issued a statement about the security of the Vodafone Sure Signal femtocell, which is available in the UK to boost signal strength indoors.

On Wednesday last week a security group called The Hacker's Choice said it had managed to reverse-engineer the equipment, enabling a modified femtocell to intercept calls made by Vodafone customers within 50 metres of the rogue device.

HTC Corporation has promoted Jason Mackenzie to the newly-created position of president for global sales and marketing. He'll continue in his current role as president of HTC North America and Latin America until a replacement is announced.

Mr Mackenzie will report directly to CEO Peter Chou.

Mobile application developer Handmark says it'll turn its social apps business and mobile ad services group into a new company later this month.

The new company will assume ownership of the TweetCaster and FriendCaster social apps, which have seen more than three million downloads.

Mark Bridge writes:

In this week's podcast feature we're joined by Jack Wraith, chief executive for the Telecommunications UK Fraud Forum and chairman of the Mobile Industry Crime Action Forum.

He talks to Iain Graham about the current state of voicemail security and the improvements to mobile security we've seen in the last few years.