I read an article a few months back about WiFi calling and the article said that when you enable your phone for WiFi calling it can mess with your cell phone reception.The day after I read the article a friend told me that she used to have cell coverage at her mothers house but now there's no coverage there. The week prior I enabled her phone for WiFi calling so I told her to disable the WiFi calling on her phone. Once she did that her reception her mothers house was fine.