A Plano 911 operators recommends using your cell phone's keypad lock when putting your phone in your pocket to avoid butt-dialing.
Changes in the wireless phone world are creating a strong market for used phones.
"I'm think about selling it," said Russell.
A number of retail stores from Radio Shack to Best Buy are offering buy back program for used phones.
"Just like a used car market," said Tom Tullie, "there's a market for used cell phones."
Tullie says as new generations of smart phones hit the market, owners want to upgrade, creating a large supply of used phones.
ECO ATM pays for the phones on the spot then sells them to wholesalers who put them on eBay or to foreign like China and India.
"Our society wants to keep trading up and trading up and this really give you a beautiful opportunity to put your phone in, sell it and go on to something else you want," said Tullie.
A used Apple iPhone 4 often sells for between $300 and $400. Motorola Droid and BlackBerry phones are also popular on the secondary market.