data plan for non smart phone

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http://androidforums.com – Hello everyone. Lots of great informative info here. I am with AT@T and have an older Nokia non smart phone with a $10.00 per month unlimited data plan which I roughly use around 350mb per month. I was considering getting a G I5500 unlocked phone and need to know if they will detect it and do you think they will alter my data plan? thanks in advance (General)