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No internet 4G when on voice call.

Who is your carrier and is that (LTE) enabled on your account (it has to be for Verizon anyway)? Then check in settings and make sure it's selected there too (LTE).
 
My carrier
 

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I don't find where Nextel has VoLTE, you can call them and ask but I think you are out of luck for right now. After the sale settles whoever acquires them may add it. For what it's worth, TIM does have it.
 
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