Can't enable WiFi calling on iPhone 6s
So when my wife tries to enable WLAN calling on her iPhone 6s, here at our house on WiFi, she gets the following error, which AT&T support was not very helpful troubleshooting:
"Oops! Wi-Fi Calling can't be turned on right now. Please call 611 (APP0008)"
So she bought her iPhone new at an Apple store in China, and when she moved to the US, she went to an AT&T store and bought an AT&T Sim card, and now pays an AT&T bill. The AT&T rep she talked to said that since it's not "originally" an AT&T phone, it will never work with WiFi Calling. Does this sound right?
We could buy a Verizon SIM card, and stick it in her phone, but I'm afraid we'd run into the same WiFi Calling problem with Verizon, where they'd say it's not "originally" a Verizion phone, so we're out of luck. Bought a used Microcell booster on eBay too, but I might be out of luck with that as well: https://forums.att.com/t5/3G-MicroCell/Difficulty-logging-in-to-the-activation-website/m-p/5914741#M30636