Apple's mobile devices account for more than half of smartphone ads according to new research. According to Millennial Media, billed as the largest independent mobile advertising network, Apple has a 55 per cent of smartphone ads.

Google Android phones are next with 19 per cent, while BlackBerry maker RIM has 16 per cent, with Windows Mobile holding on to just four per cent. Additionally Millennial Media adds, Google enjoyed a 690 per cent increase in mobile ad requests for Android devices since the beginning of 2010, while Apple's iPad had seen a 327 per cent growth in ad requests in just one month.

Reporting the findings, Millennial Media noted developers are covering as many platforms and smartphone providers as possible. "The fact that more devices are being launched by the different handset manufacturers and the fact that developers are choosing to develop on multiple platforms, continues to show that where there is money to be made, developers will go there," said Steve McCord, head of product development at Millennial. "In addition, it shows that the larger the reach for any one particular application, the higher magnetisation growth opportunities that affords them."

Millennial Media's Mobile Mix tracks and reports monthly mobile device trends. Based on Millennial Media's network data, the Mobile Mix highlights monthly trends for connected devices, mobile manufacturers, and operating systems.