I don't need a 4G proxy. I've tried several registration methods.
1. Using a cloud phone and a residential IP worked fine.
2. Using my own phone and a VPN, clearing cached data and changing IP addresses each time, worked fine.
Registration issues are usually caused by a certain phone number range being blocked.
Right now, I'm more concerned about minimizing memory usage so I can manage more accounts on my computer.
The solutions I've found so far all use too much memory. My computer can only handle 50 accounts before the memory usage becomes too high.