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How to contact the Blizzard legal department.
Information on Phone Number Not Eligible for Callback error
Some games require that you add a phone number to your Battle.net account
What to do if you don't receive texts from Blizzard
When you buy a new subscription or you change your payment plan, an authorization hold will be immediately sent to your bank
What to do when you receive the error "The phone number is invalid" when adding a phone number to your Battle.net account