Nokia has announced two new Windows Phone devices and two feature phones at Mobile World Congress today.

Both of the Windows Phone smartphones are mid-priced handsets, with initial availability expected within a few weeks.

New figures from messaging threat protection specialists Cloudmark have revealed that text message spammers used more than 350,000 unique SMS spam variants in 2012.

December saw the widest variety, with more than 53,000 different variants received worldwide.

Cellebrite, which already offers mobile phone retailers a content transfer and fault diagnosis tool for smartphones, has announced what it’s describing as “the industry’s first and only Multi-Channel Diagnostics Solution”. It’s designed to improve customer service by offering consumers a variety of options if they believe their handset has developed a fault.

The handheld Cellebrite Touch diagnostic device was originally launched in 2011, enabling retail staff to automatically detect and correct issues by connecting the device to the customer’s phone.

Alcatel has already declared that its new One Touch Fire is the world’s first smartphone running Moxilla’s Firefox OS - but Mozilla says it’s also working with LG and ZTE to build the first Firefox OS devices… and notes that Huawei will follow later in the year.

These first-generation Firefox smartphones are expected to launch in Brazil, Colombia, Hungary, Mexico, Montenegro, Poland, Serbia, Spain and Venezuela.

TCL Communication, the company behind the Alcatel One Touch range of mobile phones, is revealing a portfolio of thirteen smartphones at Mobile World Congress tomorrow.

Ahead of that, it’s shown off its updated One Touch Idol series and has unveiled two brand new devices.