The Motorola C139 is a GSM phone with compatibility with most operators including T-mobile and AT&T. It doesn’t play MP3s or do anything fancy at all. But it does have a color screen and support basic modern-day cell phone functions. So why should you care about the C139? It’s dirt cheap. It has a retail price of $55.99 but can be found on eBay for as low as $19.99 plus shipping. At that price, it’s almost cheap enough ...