Will an iphone 3 still work without internet?

I'm currently with t-mobile. I have an unlocked iphone 3 from at&t that will still work with t-mobile service. My t-mobile plan does not include data/internet plan. I do NOT want to change that but i want the iphone. Can i still use it without internet plan? Can i still use the Wi-Fi on it? And my major concern is that when i switch my phones they will add internet anyway. Please leave helpful and detailed answers.

No. You can't use it without the data plan.unless you change the ecid number

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