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All replies
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Helpful answers
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Aug 17, 2016 5:07 PM in response to giggsGIGGLESby elcpu,This article may help.
About cellular data settings and usage on your iPhone and iPad - Apple Support
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Aug 17, 2016 6:12 PM in response to giggsGIGGLESby Phil0124,Who is your carrier?
Some carriers do not support Voice and Data at the same time.
Verizon was one of these carriers in the U.S. until 2014 with the iPhone 6 & 6Plus when they enabled their Voice over LTE support.