> Country codes can start with 1. There doesn't seem to be a +11~, but is it forbidden?
No country code (or phone number) can be a prefix of another. There cannot be a +11 country code, since after the first 1 you are already within the NANP "country" (and it seems the NANP rules disallow area codes starting with 0 or 1, so the next digit can only be on the 2-9 range).
No country code (or phone number) can be a prefix of another. There cannot be a +11 country code, since after the first 1 you are already within the NANP "country" (and it seems the NANP rules disallow area codes starting with 0 or 1, so the next digit can only be on the 2-9 range).