S8 PLUS I HAVE, and a nightmare going to the tracfone side. they tell me THE S8PLUS ISN'T WIFI CALLING compatible. like a dummy i asked for sim enabled wifi calling feature because my att sim wouldnt turn on wifi calling. once i got the tmo sim, installed, IT DISABLED WIFI CALLING BUTTON, after all that they said i must have tmo s8 plus to get it to work. my device is unlocked. THEN I found out that it was carrier not letting att s8s to use wifi calling. im lost. i need a true MNVO that doesnt lie....and does support wif i calling 100 percent.