Sell Smartphone

looking to sell a couple of HTC-One M8s (Verizon) we bought in 2014.

Question 1: If I do a "reset phone" will that wipe it clean?

Question 2: I notice some sites that offer to buy the phones. Recommendations and/or advice welcome.

Thanks, everybody.

from Android Authority Forums http://ift.tt/1PO8nbz
via IFTTT