Iphone 4.can the sim card be removed?

I have a Iphone 4 that I purchased with my AT&T plan. I want to switch to a cheaper plan. Can the sim card be removed and another inserted?

Yes it can but iPhone use micro sims

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Yea… Just use the SIM ejector tool that was included & eject the SIM. Of course if the plan in question is with a different carrier then that wouldn't work since the phone is locked to AT&T.