How many times has this happened to you? You think your cell phone is in your pocket or purse...but when you check, it's missing. Or you drop your phone and, just like that, it's ruined. Buying a brand new replacement can really cost you, so why not ring up savings by going used?! Experts say the used cell market is really taking off, with phones only costing about five to fifty dollars. But, is it the right call? From warranties to activations to battery life …it's a Heads Up! on what you need to know!