will tmobile know if i root or install a rom?

GTWalling

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May 18, 2011
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As already stated they won't know if you un-root, return to stock Recovery and reset the trip counter before you send it in.
 

Mellimel22

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Mar 1, 2012
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Well for the sprint store I go to most of the staff there has rooted phones(topic came up on a recent visit).

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