Thumbs up Enable HD Voice on the Nexus 4 WB-AMR !!!!

Is there a way to enable HD Voice (WB-AMR) on the Nexus 4? For some weird reason, the Galaxy Nexus is supported by Rogers for HD Voice but not the Nexus 4.

Some people here have figured out how to enable it on the Galaxy S4:

But I can't figure out how to access the service menu on the Nexus 4 on 4.4.2...

Anyone who can figure this out will be the star of XDA's Nexus 4 forum!