The phone verification system, which Activision Blizzard calls SMS Protect, is meant to cut down on toxic behavior from players, preventing them from creating endless new accounts to evade bans or to cheat.“Mobile phones with prepaid plans may not work with the phone notification service”The problem is that SMS Protect is designed for text-enabled mobile phones, and doesn’t treat all phone numbers equally.A separate Battle.net support page notes that “mobile phones with prepaid plans may not work with the phone notification service.” It also doesn’t work with VoIP numbers.It’s unclear whether Activision Blizzard’s phone number requirements will apply equally for Modern Warfare II players across both Battle.net and Steam, given the game is available across both PC digital stores.In the case of Overwatch 2, Activision Blizzard has said that it’s relaxing its SMS Protect requirements for anyone who played the original Overwatch and has a connected Battle.net account."