Modern Warfare 2 players need to register a phone number and pre-paid "may not work"

Theyre also warning that players with pre-paid plans might not be able to get the process to work.

Anotherpageon the Battle.net forum advises that mobile phones with prepaid plans may not work with the phone notification service.

Call Of Duty: Modern Warfare 2 launches its offensive onSteamandBattle.neton October 28th for 60/$70/70.

Dont forget to bring your phone into battle, I guess.