My iPhone 6 won't get data. Since yesterday it only stays on 3G or 1x or Verizon with full signal bars. My husband has the same phone with no issues so I know it's not the area. Can't send or receive any text messages unless I'm on wifi. I have tried all of the troubleshooting you have, including removing and reinsertion of sim card, network reset and full reset, toggled airplane mode, toggled data settings, etc.
We always want you to have great service. Have you made any recent updates to your phone's OS or downloaded any new apps? Does this happen everywhere or only in one location?
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