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What frequency does Umobile use?
Are you on 4.1.2 or 4.2.1?
What baseband are you using?
You like this post
Two roads diverged in a yellow wood,
And sorry I could not travel both
And be one traveler, long I stood
And looked down one as far as I could
To where it bent in the undergrowth
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i dont know if its related to your issue but it happened to me before and it was always "roaming" ... i changed to WCDMA and it fixed that. i dont lose signal at all using 3G now