Is there a place where I can sell used 2g phones?

pu1. You can buy a used 2g phone at the post office and sell it to the post office

2017-12-01

OK

pu2. There are still many people who use 2g phones, so it will be sold if it is sold in a used country or something like that

2017-12-01

OK

pu3. They sell 2g phones in second-hand countries

2017-12-01

OK