I am making this post to ask for help from Activision support and that there was another post asking for help for the same thing and they closed it for some reason. The problem is that many users when entering MW3 ask them to verify the account using a code that will show the number of phone already assigned to your account, what happens is that the code does not arrive in any way, I have searched on the battle net site but no solution works, thanks in advance for the help
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same problem 10 days
Blizzard and Activision operate separately. Activision does not read anything in this Blizzard forum. The verification code issue can be the result of many different things, but it’s better to wait a while between attempts because you can lock yourself out trying repeatedly in a row.
Battle net support* 
Unfortunately, the support staff already answered several threads regarding the verification codes. They absolutely cannot assist with the verification process. It’s done through another system that Blizzard uses. There are some reasons that you won’t get a code, like some prepaid numbers won’t deliver them. Another reason is the number is attached to a separate or banned account.
Good topic helped me much