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Help only 4g data?

How is it that on tmo I ONLY get data if I'm on the 4g? If it says 3g, I got nothing at all. If it says G, I got nothing. If I got E, SOMETIMES I can creep, but most times again nothing. I'm running cm 10, but it has been a problem for as long as in can remember, and with multiple rooms. Is there a radio that needs flashing or something, or is it tmobiles fraudulant data claims again ?
 
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