I bought one of the unlocked Galaxy S7 from Best Buy that is "compatible" with most carriers to include AT&T & Verizon. I also have an LG Urbane 2nd Edition LTE from AT&T and was using numbersync. The unlocked S7 worked great with Verizon. When I took the SIM card from my AT&T iphone 6s Plus that was doing numberysnc with no problems, numbersync quit working. After hours on the phone with AT&T support, I was told that the unlocked version of the S7 SM-G930U doesnt support HD Voice and therefore numbersync wont work. Has anyone else had this issue or did they just say that so I'd swap out the unlocked S7 and get an AT&T phone?