Help needed. Phone calls slow/not working on Note5.

    I just switched over from AT&T and my phone is taking 35 - 40 seconds to make phone calls, or they don't go through at all. Texts and E-mails are fine. I tried my SIM card on wife and son's phone and they work fine (Apple 6s). Are there any settings I can change? Has anyone else had this problem? I'm waiting for the Note 8 in September, so I don't want to change phones until then.

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