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Using Voice Over LTE (VoLTE)
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- VoLTE uses the LTE network to make higher quality voice calls. The phone you are calling also needs to work with VoLTE 
- 1.From the home screen, tap Settings 
- 2.Tap Cellular 
- 3.Tap Cellular Data Options 
- 4.Tap Enable LTE 
- 5.Make sure Voice & Data is selected