My wife and I got brand new HTC radar phones a couple of months ago. A few days ago hers started flashing white and black and vibrating until the battery died. Mine just started doing the same thing but I got a "Sim card missing or invalid" error beforehand. Neither of us now have a phone. Is there a way to reset the sim card? We have no other sim cards available to try a replacement.
I am sorry to hear both phones failed. Are they able ti turn on or charge? If they dont charge or power on then we need to check out this document Cannot turn on or charge device: Windows Phone
If they don't charge or power on then without physical damage it will lead to an warranty replacement.
If you are not a T-Mobile customer then you can contact HTC directly for warranty/repair information
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