Switching a data sim card for AT&T into an iPhone 3G?

I have an AT%26amp;T data activated sim card. If I would put it into my dads old iPhone 3G would it work okay? I would have my unlimited data, texting, etc correct? Thank you ! I hope it works!Switching a data sim card for AT%26amp;T into an iPhone 3G?
So long as the SIM card is the right size, is not disabled, the bill is still being paid for it, and it's an American iPhone (and thus unlocked to AT%26amp;T), then yes, it would work.Switching a data sim card for AT%26amp;T into an iPhone 3G?
Data Unlimited Data,texting all works ..also you can call the service provider and get that details Regarding this...But,the main thing that the I-Phone 3g must be an Unlocked Mobile...then only it works....with it...if the Mobile is Locked means it won't support any other Sim Card.....If You need to Unlock means ,use the Unlock code,You can get the Unlock Code at reliable cost at here,

%26gt;%26gt;%26gt;%26gt;%26gt;%26gt;%26gt;%26gt;%26gt;%26gt; http://www.mobileunlocksolutions.com/app鈥?/a> %26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;%26lt;

and Unlock the Mobile from the Network Lock.I unlocked my Mobile there from Vivo Network Brazil Country.............then You can use any GSM Sim in I-Phone 3G...

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