Q: Problem with App Store Login
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Apr 6, 2016 7:31 AMby Nubz N.,Hello antonioccb,
That is a confusing set of symptoms you have there.
It sounds like you were able to connect to the App Store before updating to iOS 9.3.1.
Your Apple ID and password are fine as they work on another phone and with a 3G network.
Yet you can't connect using LTE.
I gather you can still connect to the Internet with LTE and browse the web as you state this is an App Store issue.
There are a few articles for troubleshooting connecting to the iTunes Store specifically.
If you can’t connect to the iTunes Store - Apple Support
Advanced steps for fixing issues with iTunes Store connection - Apple Support
If you aren't connecting to the Internet at all with LTE then please see
If you can't connect to a cellular network or cellular data - Apple Support
You may also want to check your APN settings
About cellular data network settings on your iPhone and iPad - Apple Support
Take care.
