You have to use the contact support option on the main Game Flip site and send a support ticket explaining you want your current phone number changed.
I already did that but they didn’t answer me
They take a few days to get back to you. They helped me change my number last week.
Yes, you will need to wait for Support.
However, meanwhile, you can also send a private message to DarkKnight and MajorTom directly regarding it instead of tagging them.
You would probably need to give them your invite code, old phone number and e-mail.
Reference - I need to change the phone number on my account
Sorry for the wait.
Has your issue been resolved?
If not, please provide me your ticket number and invite code.
I have the same problem, can someone help me please
To request a number change, you need to open a ticket for the Support Team ok.
Please contact the support team using the link below: