Good luck with the above..
I have a younger sister who is practically addicted to mxit...
Even by confiscating the phone, he will find a way around it.. Believe me.. wap enabled phones are availible very freely, and if he made up his mind, nothing will get in his way..
All I can suggest, is have a chat with him, don't get too angry, and find out WHY he enjoys it, as well as what exactly he enjoyes. Once he feels that its okay to talk to you about it, it will more likely become less of a problem. If teens get shamed about something, they will live with that shameful thought forever. As a parent, you guys infuence teens extremely. One wrong word, can change their lives, and give them a whole different outlook on life...
The above, coming from a has been teen, who did all there is to do, learnt what was needed the hard way, and decided to put her experiences and mistakes out there, to help people and advise on everyday issues, as no one was able to advise her.. Its better to know in advance, equipping you with the skills to cope if the situation arises..
Remember that in the life teens are living in today, anything goes... Its important as parents to first LISTEn and then only once yu have digested the info, act on it, in a correct way...
Thnx for letting me share