A valid mobile number and a valid email address are both required to register with Betano. You'll use these to receive your activation codes and to stay in control of your account.
If either of these needs to change after you've registered, see "How do I change my mobile number?" or "How do I change my email address?" for the steps.
If your account hasn't been activated yet, you can correct your mobile number or email address directly during the activation process, before entering your verification code.