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Help No signal

Which carrier? Do you mean an empty triangle for the signal bars or does the whole symbol go away? Screenshot?
 
ATT is the carrier. Yes an empty triangle, but it still shows the H which I assume means 4G.
I should mention there is a zBoost cell signal booster in the mix. The warehouse I work at has little to no ATT signal inside. I have only been able to catch the phone doing this at the warehouse and have decided the phone may be trying to switch between the cell tower and the booster.
 
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