Well, ive been selling cell phones at radio shack for quite some time, and we always have customers who did not have insurance on their phones, so they need a inexpensive replacement phone, i was always told to sell them a regular phone at retail price (about $219.99) which discourages alot of people quickly. Well in theory why wouldnt a cheap motorola c139 phone work, or are there any other go phones that work better than the others? such as the nokia go phones? I just want to sell a go phone that should work on the spot. and ive heard mixed reveiews about using certain types of cingular sim cards with the motorola c139 go phone, thanks Phil