So if this is 4G = LTE, then this is an absolute nightmare for voice calls. Today at least phones need to be provisioned for VoLTE and it's not something that's as simple as GSM/UMTS/HSPA was. Essentially negotiate a few parameters and give me a channel to talk on seamlessly. When roaming anywhere I always drop off to HSPA to complete the call and here in my home country of Canada no 'International Version' of a cell phone will do HD Voice or VoLTE or LTE-A.
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So if this is 4G = LTE, then this is an absolute nightmare for voice calls. Today at least phones need to be provisioned for VoLTE and it's not something that's as simple as GSM/UMTS/HSPA was. Essentially negotiate a few parameters and give me a channel to talk on seamlessly. When roaming anywhere I always drop off to HSPA to complete the call and here in my home country of Canada no 'International Version' of a cell phone will do HD Voice or VoLTE or LTE-A.