Samsung S4 reg90 error unable to connect

[demyansk]

I have this phone and it used to have the T- Mobile carrier. I got the phone from my sister and I do have it connected to my WiFi and can use it as a tablet. When I go to settings, more networks, where it shows Wi- Fi Calling, I have it on but it says Error: REG90 "Unable to Connect"
I have looked all over the internet to find this. I still have the t mobile apps on the Samsung but I am not sure if I can get the lewd from sister, I am waiting for her to email back.

Any suggestions?
Thanks, I don't have a carrier, only a fraction, would like to see if I could make wifi calls in the house

 

[Phillip Corcoran]

Without a working carrier/network provider on your phone you won't be able to make any type of calls, not even over WiFi.

 

[demyansk]

Thanks Phil, I didn't realize my sister still has T _ Mobile and I guess she will have to call about the phone, however, I did get it to work by going through Google Hangout app and I have a phone number from Google that I use. It said something about SMS, I tried it and it works, just press the google hangout app, dial pad comes up and make the call and it uses my google number. Thanks guys for your help