iPhone used without data service, input Sim card?

Someone told me once that they used their Sim card from a non data phone in the iPhone and it worked as far as cell service goes, like a iPod Touch with cell.

Is that true? I'm about to get the new iPhone 4s and I was thinking about selling my old iPhone 3G really cheap to a family member so they could use their ATT sim card in my ATT iPhone but not have to buy the 3G service, I know the 3G part won't work but as long as the cell part works they should be OK.
REIUSAAsked:
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moon_blue69Commented:
Yes you can. You dont need any data bundle. Get a normal sim trim the sides of to make it a microsim and it will work. I have done that. If you need any help with that let me know.
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moon_blue69Commented:
Sorry I got wrong. I thought it was iphone 3. Yes it will work on all phones. 3G is only for faster download. It will work as a normal phone. Why not throw a sim in and see it yourself.
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darbid73Commented:
Just so you understand a few things - All GSM sim cards are the same.  They must be to meet the GSM standard.  Thus there is no such things a non-data sim card.  What differs is the package/contract/or services that the telephone operator that has supplied the sim card has offered.

So to answer your question you can put any GSM sim card from anywhere in the world and from any GSM service provider into your iphone you want, and your iphone will perform and/or do the things that the sim card will let it.  This is one of the benefits of a standard technology.

So if you put a sim card in there with no data package attached to the service from the telephone operator then you will not be able to send or receive packets of data.

Things like calls and sms will still work, assuming of course this has been enabled in your services.
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maximus5328Commented:
AT&T reserves the right to add the data plan to your account automatically if they determine that you are using an iPhone without one.
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darbid73Commented:
...GSM sim card from anywhere in the world and from any GSM service provider into your iphone you want,

One small note - this is providing your modem part of your phone is not locked to a service provider, which is normally the case (but changing) in the US.
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REIUSAAuthor Commented:
Thanks for the info, that's good to know. Once I get my new phone I figured we can test it to be sure.

AT&T reserves the right to add the data plan to your account automatically if they determine that you are using an iPhone without one.

Is there any way they can tell if you don't tell them?
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REIUSAAuthor Commented:
Thanks for the info.
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