A while ago there was some talk of one\some of the TelCo's offering the improved audio codecs for calls made to other mobiles on the same network, it's been noticed here that calls made from VF to VF with both parties using HTC One M8's sounds crystal clear, whereas a call made from VF to Spark using the same handsets sounds notably worse and a call from Spark to Spark is somewhere in the middle.

Regardless, moving from iPhone 4S's to the M8's has made a notable difference for all involved, but where are things at with regards to the TelCo's intercommunication using more modern audio CoDecs?