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RE: Are You a Verizon Customer and Suddenly Using More Data Than Usual?
This isn't an iPhone 7 or Verizon issue. The iPhone switching to cellular data when wifi signals are weak is a feature of iOS introduced in ios9. It is there purposefully to assist weak wifi signals but sometimes doesn't seem to work the way intended. Wifi assist can be turned off so that when on wifi it will not use cellular data at all, even if the wifi connection is weak.
To enable or disable this, open setting then go to cellular, then scroll all the way down to the bottom and you should see an option for wifi assist.
Thanks for the info @splits. I'll try this. The timing of the iOS 9 launch doesn't coincide with our issue though. We were fine until November, when the increased data usage began.
It could be something different altogether, but I have noticed if I update my devices it gets activated once again. Also, the reps you usually talk to on the customer service end don't really have much of a clue how to fix these issues. Still worth checking it.
I'll definitely try what you suggest to see if it makes a difference. Apple's iOS releases are notorious for bugs. Thanks again!