iOS 10 cellular data broke

My daughter has an iPhone 5 c she's had for about two years and it has worked very well. She has updated to iOS 10 and mobile data has not worked since. I had a Verizon technical support check the account, and two different Verizon stores have changed the SIM card with no luck. They say it's a matter of Apple. The strange thing is, if I swap the SIM card from my iPhone in the 5 c 6, it works perfectly.  Did not work with it's original SIM or to one of the two new Verizon SIMs.

I reset the network settings again and again. Cellular data do little to 3G or not on LTE. I even went as far as do a DFU restore on it for new firmware and software and set it up as a new iPhone, just in case it was a software problem. I'll take it to the Genius Bar at my local Apple store, but it'll be a couple of days until I have time to do... so any ideas on how to solve this problem?  I tried all the solutions I can think or even randomly as I find on the net.  Nothing has worked so far. The only error message I get is "could not activate cellular network' when the phone tries to connect and fails.  Texts and phone calls work well and the wifi has either no problem. Simply not cellular data at all.

Thank you!

Hello

See if there is something that you haven't tried here > If you can not connect to a cellular or cell - data Apple Support Network

Tags: iPhone

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