How to cheat a mobile operator?

Question

Telecom operators

there is an unlimited tariff plan of the Ukrainian operator only for a 4g modem.
What data is being checked? what needs to be changed in the phone so that the operator thinks that the 7 card is now in the modem and not in the phone?

Answer 1

Packet TTL needs to be changed

Answer 2

BUT if your type of phone suddenly starts downloading updates for windows, the operator may suspect something.