First of all, please, take into account that the phone verification process is optional, so you may stay on e-mail confirmation and skip verifying your phone number.
However, if you'd like to attach the number to your Personal Area and face some difficulties with getting your SMS code, you can also request the code via the voice confirmation.
To do that, you need to wait for 5 minutes from the code request then click on the "Request a callback to get the voice call with a verification code" button. The page would look like this:
