they're totally capable of erasing all your data, but we have seen far too many examples of refurbished phones go out there with people's contacts and e-mails and photos and videos still on their phone. you have to use this website to make sure all of your data is really written off. >> some folks want to perhaps cash in their phone, that old phone, you know, get it exchanged for cash. there's a place in which to do that. gazelle.com. how does it work? >> gazelle a finally gaining popularity. no matter what kind of phone or electronic you have, you type that into gazelle g.com and they'll give you an offer. they even pay for your postage. but also flipswap.com is another option. they can give you a bid, free postage or you can donate it to your favorite charity or cash it in for retail cash so you can trade up and get a bigger model. for flipswap, every phone that you donate, they plant a tree, which is kind of cool and