Phone number Problem

Hi, with this beta the phone number verification will be applied right? I have already purchased the Watchpoint pack so I have a guaranteed access to the beta but I have a pre-paid mobile phone number and that’s the one I had all my life. I just realised that you cannot connect a pre-paid phone number to your Battlenet account. Does this mean that I have to buy another phone number and possibly another cheap phone and connect it just in order to play the game every single time?