in LTE mode no incoming and no outgoing call | Razer Insider
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calls not working in LTE mode

only working in 3g/2g mode

in LTE mode no incoming and no outgoing calls
You are possibly on a CDMA network. This is the issue I have in Korea. I can get LTE/4G+ data on my phone, because the provider I have provides data on the LTE bands this phone supports. But for voice calls it has to use a UTMS band which is a 3G band that this phone supports and my provider uses. This is a GSM phone and will not work in 4G/LTE mode to make and receive calls. If you want to understand the technical details refer to Wikipedia or Google.