A sim card would cost me 30PHP to 50PHP (which is equivalent to 0.5 to 1 US dollar).
I would just replace my phone sim and I can verify a gmail account myself.
Just saying.
Not every countries sim cards are cheap like me and you. In my country a prepaid sim would cost me around 25 cents which can be used to verify up to 6 gmail accounts
And you won't use your own sim card if you have something illegal to do. For that, these gmail accounts helps us and not our own