http://www.ictqatar.qa/output/Page1811.asp

and here also some more details

http://www.ictqatar.qa/output/page39.asp

Regards!!

PS: just as a foot note: it is said that Qtel and Voda are working with their customers to facilitate the tarnsition; however (not surprised at all!!) no email or sms notification has been sent to me "as a customer" to be aware of this upcoming change. Definitely we need a real "customer service oriented business"