Wifi calling suddenly stopped working on my Iphone 6plus

[richjenn13]

Been using Wi-Fi calling on my iPhone 6 plus for a year - no issues. Suddenly it stopped working - phone shows "no service".

Nothing has changed - it happened out of the blue. Tried 2 different Smarty SIM cards and neither work.

Both work in another phone, so it seems the phone is the issue.

Any clues anyone?

[MSF]

@richjenn13 Any recent updates in the operating system?

[richjenn13]

Good question.

Nothing I can see - checked my settings and my IOS is showing "up to date"

Suddenly, wifi calling has returned to my iPhone. Baffling!

Thanks for your input.

[richjenn13]

And just as quickly it has disappeared agin!

Baffled!!

[MSF]

@richjenn13 Please correct me if I'm wrong, but doesn't wifi calling only come into effect if the standard mobile signal is too poor? My iPhone only rarely shows wifi calling as I usually have good mobile coverage here (fortunately.....hope I haven't jinxed it!)