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  1.    #1  
    I am using unlocked Cingular Treo 650 on Tmobile network. It works great for 2-3 months and then starts random reboots. After a while reboots become constant. As soon as I replace the SIM card, problem goes away for another 2-3 months. The same card that goes bad on treo 650 works fine on treo 600 and any other phone.

    Any suggestion?

  2.    #2  
    Found solution to this problem by doing more searches on this forum. Problem is unrelated to t-mobile, but due to loose SIM connection in 650's sim tray.
    I inserted a piece of paper beneath the SIM card in the tray and problem went away!

    Lesson: search the forum well before posting questions!!

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