In this week's edition of The Fonecast we're chatting to David Emm, senior security researcher at Kaspersky Lab UK, about the security threats facing mobile phone users.

We also discuss the latest report from mobile tariff comparison site Billmonitor, we talk about Tuesday's Symbian news, we look at a new unlimited internet deal and we discover a clutch of MVNOs.

A new report from Gartner says the Apple iOS will dominate table device sales until 2015 - and will account for more than half of annual tablet sales for the next three years.

69% of tablets sold this year are expected to have the Apple iOS, dropping to 47% in 2015.

49% of smartphones sold around the world will be running Android at the end of 2012, according to a report from Gartner.

Total worldwide smartphone sales are expected to reach 468 million units this year, which is 57.7% up year-on-year. Android is forecast to have 38.5% of those sales, making it the world's most popular mobile operating system.

Apple says it'll be holding its annual Worldwide Developers Conference from 6th - 10th June 2011 at San Francisco's Moscone West building.

The company has previously announced new iPhone devices on the first day of the WWDC - most recently, the iPhone 4 was revealed at WWDC 2010 - which suggests that the 'iPhone 5' could be the star of this year's show.

Independent app store GetJar, which has now seen over 1.5 billion downloads, has released data from its recent global survey. Almost 40% of respondents said they'll switch to Android when they purchase their next mobile phone, compared to 18% who intended choosing an iPhone.

Almost 34% of consumers spend at least an hour every day using applications, compared to 49% who spend the same amount of time watching television.