As an added layer of security against cheaters for Modern Warfare 2, Infinity Ward asks every player to verify their identity by linking their phone number before they can play. This shouldn't be too much of an issue for most players, but a portion of users on Steam appear to be running into the same issue where they are asked to verify their number despite already doing so previously, and cannot proceed because Steam won't let them verify their phone numbers too often in a short space of time.
Earlier this month it was announced that Blizzard is partially removing the same mandatory SMS verification in Overwatch 2. Overwatch 1 players who already had a Battle.net account no longer need to provide their phone number, according to Blizzard. New players, and players without a Battle.net account, are still required to verify their account via SMS. Users can only associate one phone number with an account and that number can only be used for one Battle.net account. Blizzard is using SMS verification to better secure an account and to ban previously banned players if they want to create a new account.
At the moment, it’s unclear if all Warzone 2.0 players will need a mobile phone number to play that game once it arrives on November 16th. Since 2020, Infinity Ward has required all free-to-play Warzone users on PC to go through a two-factor authentication process. Activision Blizzard did not immediately respond to Engadget’s request for clarification and comment.
On subsequent launches of the game, however, you may be asked to verify your number again despite already doing so - and Steam may not let you verify it because you've already done so recently. If this is happening for you, here's what to do:
Open up Steam.
Click "Steam" in the top-left corner, then click "Settings".
Under the "Account" tab, click "View Account Details in the top-right corner of the window.
Under "Contact Info", click "Manage your phone number".
Click "Remove Number", and follow the subsequent steps on-screen to remove your phone number from Steam.
Now open up Modern Warfare 2 and follow the standard steps on the "Mobile Phone Number Required" screen to re-add your phone number.
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