Can I be tracked with VPN

Hi
I want to register on a game, but the developer wouldnt let me. Its a stupid game, cyclingsimulator. I can register from any other device even in my house, just from my phone he blocked me somehow. That is strange, I am using a VPN so he doesnt recognise me, but its still not working, somehow they know it is me. Maybe he tracks my phone after the phones IP adress? Can the IP adress of the phone be changed so he or the system doesnt recognise this device? Thank you