Why does wifi calling not work with my phone?

[AC Question]

I live in a somewhat rural area and usually cannot get T Mobile service, so I use wifi calling. I just found out that sometimes people call and get no answer or even voicemail, and at these times I don't even get a missed call notification so I have no idea they called! Especially bad because I am job-hunting. I am doing trouble-shooting with my router, but has anyone else had these issues?

 

[Golfdriver97]

Welcome to the forums. What device do you have?

 

[Chella777]

Thanks Golfdriver97 - I have a Galaxy S4. (Also, yes, the question was asked by me.)

 

[Almeuit]

Sometimes wifi calling would do this for me. I switched phones and it stopped but on some older phones (my Note 4) it would do this. I never found out why sadly .