This feature seems more hardware related than software. Our phones share the same Radio that Nexus 4 despite the delay of baseband upgrades and Nexus 4 is capable of the AMR-WB feature that should be enabled in the system. The codec AMR-WB is supported in Andr0id+3.0.
Any updates on this? Looks like nobody knows the answer
I have created a simple guide to check if a call is HD Voice, using a compatible Samsung phone. If anybody could test it out and report back, I'd be grateful.