What is the procedure to successfully use a 3G iPhone without data plan?

[Terp]

I've recently purchased an 3G iPhone from a friend. It's already jailbroken (but not unlocked). And I want to use it without data plan, since I live in campus so there's fast wifi everywhere. Is it possible?
What are the procedures that I have to followed?
And I am an At&t customer already.

Would they find out anyway?

Thank you very much.

 

[Tallest Skil]

Yes, they would find out anyway and add the plan back on.

You can have a 2G iPhone without a data plan, but not a 3G.

 

[bdsmyth]

Restore it from scratch. Then jailbreak it, then unlock it. After that you can put your existing SIM in and do what the hell you like with it. There's plenty of tutorials in this forum that cover the whole process end-to-end

 

[Roessnakhan]

Restore it from scratch. Then jailbreak it, then unlock it. After that you can put your existing SIM in and do what the hell you like with it. There's plenty of tutorials in this forum that cover the whole process end-to-end

They still detect that you run an iPhone via the IMEI and will add the data plan. The only way to avoid a forced data plan would be to unlock it and use it on a different carrier.