Can I use an Iphone without paying monthly?

Say i bought a used Iphone off of ebay and just slipped my non-smartphone's simcard into it, would there be a monthly charge or would it be the normal cost? If I didn't have a data plan I wouldn't be able to use internet wherever I go, but would I still be able to use internet where there's Wi-Fi, sort of like an Itouch? My phone company is AT&T if they helps.

You put a sims card into an phone sorry. The only thing you could do is maybe use the web if you have Wi-Fi

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