Smartphone with a prepaid plan with no data?

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http://androidforums.com – I am currently on the $15 a month unlimited texting prepaid plan from TMO w/o data service. I have a semi smartphone (Nokia Nuron 5230) that doesn't have wifi which is all I want. I have wifi everywhere I go, so I do not really need a data plan. If I bought a TMO smartphone on ebay, would I be able to get into it without a data plan and just use it for calling, texting, and wifi (internet surfing)? Do I have to buy an unlocked? I hear that the mytouch3g doesn't allow people w/o data service to even enter the phone, so are all the smartphones that way? I don't know anyone who has tmobile a (General)