I am having this same exact problem except I am not anywhere near home and this is the only phone I've got to make calls with and it doesn't work. I've never seen more than 1 bar in either 3G or 4G (and i'm not even sure if there is 4G coverage in this area).
Can I still use the phone I had before the upgrade to make calls?
You don't need 3g or 4g to make calls. Just use your Nexus...............
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