Mobile phones aren't all that mobile when it comes to switching carriers—or even owners. It may seem like a no-brainer to accept a hand-me-down phone from a friend or family member or buy a used ...

Buy now, pay later sales on Cyber Monday are expected to reach $993 million, driven in part by mobile shopping trends.

My best advice though is to go to trusted companies that buy old phones, refurbish them and sell them on. I've used MusicMagpie in the UK and had no problems. Its online catalog is vast ...