hey mate, did this exact same shit to uber at one point, they block your mobile from signing up,etc
what I did was, I went to coles and bought a $30 android phone and bought a piss ton of lebara sim cards (they already come with mobiles, you can sign up with the same ID multiple times) and then signed up for a post office prepaid visa card and signed it up to the uber, haven't had any issues since
and also since its just a pos $30 android phone you can root it and use the deviceid changer whenever as it's just an uber phone.