My Service is ATT and I don't have a data plan. I see lots of used iphone 3Gs for about $150~$250 condition from very scratched but working to almost new.

I have WiFi at home and at work and I don't plan to use the internet while driving so I really don't want to pay $15~$25 more a month for an option i won't be using.
Well a used 3Gs iphone work without a dataplan with ATT?