I am seeking information for a study regarding the top selling cell phones of the last 18 months. I am trying to find a list that shows the top 5 or 6 best selling mobile devices (including smartphones, PDA’s, etc.) for each of the major carriers. (Verizon, AT&T / Cingular, Sprint / Nextel, Alltel Wireless, T-Mobile). I am hoping to be able to go back to January 2006 with this information if possible. Thanks!

I don’t know much about this so I need help. If my friend wants to cell me his T-Mobile cell phone, can it work with Cingular if I unlock it at some kind of phone repair shop?

Verizon wouldn’t work because they use CDMA, right? But what other companies’ phones can work with Cingular? And how much does it cost to unlock a phone?