system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do major cell phone carriers allow companies like MetroPCS, Cricket Wireless, Boost Mobile, etc. to resell their network?

And for a cheaper price, too? I don't understand.
gpt
Metro, Cricket, and Boost are owned by T-Mobile, AT&T and Sprint, respectively.  So it's basically them selling their networks to people who are more likely to pay cash money for a phone + service.  Post paid customers usually pay by debit or credit and sometimes pay their bills after the due date.  Meanwhile most prepaid companies have a set date to pay or else the customer gets cut off.