Can at&t detect that i'm using a iphone when it is unlocked?

I have an iphone 3gs and i was using it without a data plan when i suddenly got a text saying that i'm using an iphone and that i need a data plan.i've been reading around and if i unlock the phone i can apparently use the iphone without a data plan.true or not?

If you unlock the phone and go on a month-to-month data plan, I think you can do that. When you're using the iPhone, no matter what, it is recognized on their network as an iPhone. Which pings a server that notifies AT&T that there's a Smartphone without data on it. They will automatically add the data plan if you choose not to.

AT&T's system will detect if you're using a smartphone and automatically put a data plan on your line. There's no way around it as far as I know. Even if the phone is unlocked.

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