I want to put my sim card in iphone 1g?

I just broke my phone which wasn't a smart phone and my mom has an old iphone 1g w/o a sim card in it laying around that I want to use. If I put my att simcard in, is it going to charge me astronomically for internet data charges?
Or is there anyway to disable the phone from using data and just making calls/texts?

I'm pretty sure you can on the internet. With AT&T, I don't know exactly how much a data plan is per month, but you can activate a data plan for an extra, like, 20 bucks a month. It will charge you, if you don't have one, and if you don't want one, I think you'll either have to take it to that AT&T store, or change the plan online.

You will get a data plan but of course you wouldn't be charged "astronomically" if you didn't use it

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