More and more people these days are using their mobiles to play bingo online.

However, not every site is capable of working on smartphones, but the number is growing at a steady pace as new players upgrade their systems.

2012 is proving already to be hotting up in terms of competition in the mobile bingo space, and those sites who can offer mobile bingo are stepping up with various competitions to convince players to choose them over the others.

WOW Bingo is one of the earliest sites to offer a mobile version of their games, and throughout August they’re having a special competition where they will be giving away an iPhone 4S every week.

According to their press release, all you have to do is make a deposit via a mobile and start playing.

I can only presume that by doing so gets you an entry into a prize draw of sorts, but there is no other information to be found as to the specifics.

New players to WOW Bingo can pick up a £20 free trial if joining via mobile, or £15 via desktop or laptop.