No you got several standards you must check into before just buying any cell thinking it can work on your network...
The US major Standards are:
Verizon Wireless, Sprint and US cellular use CDMA.
AT&T/cingular, T-Mobile, and others use GSM - very popluar overseas too.
Nextel, Boost and a couple other regionals use iDEN.
US Cellular is a CDMA network so you need a CDMA phone - futhermore if not new in box (NIB) you need to ask the seller the ESN (electronic serial number) to see if it's been stolen by calling US cellular and asking them if it's kosher to put that ESN on their network. After getting the phone call US Celluar and give them the ESN and they will walk you though adding that phone to their network with your phone number.