If I sale my phone to another provider or hobbiest???

If I buy a phone and don't like it, so I reset it to factory settings and sale it to anyone else that then either has an account on this board or sets up an account at some point will it affect me? Will I get banned for using same device as another user? Just wondering if I need to toss in River or I can recoup some money by sale

As long as you do a factory reset and move your number to a different phone, it won't have any effect on you. If you sell it to anyone make sure you take your sim out and either destroy it or move it to your new phone (providing that it fits).