Register a phone number with SMS or voice verification.
Use the verify command to complete the verification.
+If the account is just deactivated, the register command will just reactivate
+account, without requiring an SMS verification. By default the unregister command
+just deactivates the account, in which case it can be reactivated without sms
+verification if the local data is still available. If the account was deleted
+(with --delete-account) it cannot be reactivated.
+
*-v*, *--voice*::
The verification should be done over voice, not SMS.