Why doesn't T-Mobile provision Sony Xperia phones with Wi-Fi Calling abilities to use the feature? Is it a hate thing??? From what I hear, the phones work on WiFi calling when on Mint Mobile, Metro PCS etc (which use T-Mobile networks) but when a T-Mobile SIM is used, we get no Wi-Fi calling option.
When I go into engineering mode, it clearly shows Wi-Fi Calling isn't provisioned.