Fixed REG90 cannot connect wifi calling

whatthe??

    Have seen little for repairing this error code. New Samsung Galaxy S9 on T-Mobile network. Wi-Fi calling would not enable came back with code either reg90 or reg99.

    After much research, came to conclusion that it was sim problem. I went into settings apps  shows list of app installed. Find sim tool kit. Click on icon then storage. Clear cache then app data. Reboot. Problem was fixed. Hope this helps someone.

      All replies

      • chiragc91

        Re: Fixed REG90 cannot connect wifi calling

        Thanks so much man!!! Couldn't figure out why this wasn't working I have 0 reception at home and rely on wifi calling to work!!!! You've saved my life.

          • whatthe??

            Re: Fixed REG90 cannot connect wifi calling

            Really glad it worked for you. So odd there is not more info on this issue. T-Mobile actually sent me personal cell spot at no extra charge because they could not fix. Was going to get new phone as I thought this one was defective until I did some research and voila! Also someone with Apple phone went into T- Mobile store and replaced sim. That worked. It is definitely SIM issue. Not phone. Again glad it worked.

            Whatthe??

             

             

             

            Sent from my T-Mobile 4G LTE Device

          • magenta4199976

            Re: Fixed REG90 cannot connect wifi calling

            I've been running into the same issue since I got the s9(unlocked). A reboot was always a temporary fix for me. Can anyone confirm that this fixed the issue for good? I just tried it, so I'm hoping!

              • whatthe??

                Re: Fixed REG90 cannot connect wifi calling

                Hi. Well two people I know had this work for them and have not heard that it stopped working for them. My S9 still going strong with wifi calling. Been almost 2 months now. Also am very sure it sim problem. One person with apple phone had this issue and they went in store and got new sim despite tmobile thinking it would not work and IT DID. So I have high Hope's this is permanent fix.  Good luck and please keep me posted.

                 

                 

                Sent from my T-Mobile 4G LTE Device

                  • magenta4199976

                    Re: Fixed REG90 cannot connect wifi calling

                    Unfortunately this did not resolve it permanently for me. I am pretty sure that I have my e911 address set, but I'll contact support to see if maybe I missed something there. I also have a DIGITS number linked with the number in this phone, so maybe that is causing some trouble? If it is a SIM problem as you say, maybe it makes sense to ask them for a new SIM card as well.

                     

                    I will update this thread if I make any progress with that.

                      • whatthe??

                        Re: Fixed REG90 cannot connect wifi calling

                        Hi.  I was following up to see if your issue had been resolved.  Any luck with replacing SIM card.  Hope you are able to resolve this as I know it is frustrating.

                         

                         

                         

                        Regards,

                         

                        Marianna

                          • magenta4199976

                            Re: Fixed REG90 cannot connect wifi calling

                            Hello again,

                             

                            I have been lazy, and hadn't done much troubleshooting on this issue until today. Before going directly to the store and trying to get a new SIM card, I decided to try tmobile support via facebook. I referenced this thread among other methods I have tried to fix my issue. They sent an over the air update to my phone. I was able to see the update happen as my phone said "Refreshing SIM Data" in the spot you normally get notifications for connecting to wifi networks (Essentially it just popped up in a grey box in the middle of the screen).  I'm hopeful that this is a permanent fix because it's the first time my phone went from having the error to working without a reboot.

                      • whatthe??

                        Re: Fixed REG90 cannot connect wifi calling

                        Also make sure if you are getting REG90 that you have e911 address set in your tmobile app under profile settings.

                         

                         

                        Sent from my T-Mobile 4G LTE Device

                      • magenta4956862

                        Re: Fixed REG90 cannot connect wifi calling

                        Work for me thanks for the information

                        • pip1948

                          Re: Fixed REG90 cannot connect wifi calling

                          I just used your fix and it worked. However, I have an LG7, and I do not have a sim tool kit. But I went through each app and cleared the cache as well as removed updates to apps that I don't use and can't delete. I don't know that this a sim problem as much as a memory space on the sim.  I freed up a gig of memory and it fixed it.

                          I live in an area where I get no cell service so WiFi calling is essential for me.

                          Thank you for he information, it was a life saver.

                          • jjhughe90

                            Re: Fixed REG90 cannot connect wifi calling

                            I have had a new plan and phone (LG) for about a month with no problems.  Had my phone number changed (recycled number, lots of junk calls) and immediately got this error after the subsequent reboot which would have updated the SIM.  Unfortunately this fix is not working for me.  I have cleared the cache and data in the SIM Toolkit twice now and rebooted, still getting the REG90 error.

                            • 20111704

                              Re: Fixed REG90 cannot connect wifi calling

                              will you please tell me the exact name for the "sim tool kit" that fixed your problem. I can't find "sim tool kit" on my Samsung Note 5 - t-mobile phone

                              • magenta4132624

                                THANK YOU,THANK YOU.  Now if I could just get it to stay working more than a couple of days at a time!  Thanks for the tip.

                                • magenta6451105

                                  Re: Fixed REG90 cannot connect wifi calling

                                  After trying all the suggestions I could find online regarding this issue, I went to the local T-Mobile store to replace my S8 Active's SIM due to the REG90 error with wifi calling. Actually ended up going twice because we thought we had hit on a solution but it still wasn't right.

                                   

                                  On the second visit, one of the staff agreed that sometimes replacing the SIM will fix the problem. But she suggested that before we replace the SIM we try deleting all of my saved network connection profiles and after doing that it's been rock solid - no more REG90 errors.

                                   

                                  This was driving me crazy and she nailed it. It appears there may be more than one cause for this error so add this to the list of things to try.

                                  • peabody58

                                    Re: Fixed REG90 cannot connect wifi calling

                                    Two new LG Q7+ phones/new account in mid Oct 2018.  My wife's worked like a champ.  Mine had the REG90 Unable to Connect for WiFi calling since day 1.  Tried every trick listed n the thread, but nothing helped.  My phone # also wouldn't show up on the About Phone setting page.

                                     

                                    Finally contacted T-Mobile Support and they were very helpful.  Received a new Sim Card today.  Got on the line with Tech Support, they activated the card, I swapped it out and viola!  Everything works now and my number now shows up in the settings.  I think the original Sim Card was not activated properly.   Very happy with T-Mobile support.

                                      • h5c8h

                                        Re: Fixed REG90 cannot connect wifi calling

                                        Thanks so much for the post. I had a similar situation.

                                         

                                        We changed over from AT&T to T-Mobile at the end of November 2018. I brought over a Samsung Note 8 that came unlocked straight from Samsung; so it never had AT&T's ROM on there. When I received my T-Mobile SIM card in the store, I noticed that if I went to Settings > About the number it was picking up from the SIM was the temp number I was given until the port completed (only took it around 15 minutes to complete and I was send and receiving calls/texts on my AT&T number before I left the store). However, after my AT&T number ported the number listed under Settings > About still had not changed from the temp number. I didn't think anything of it until I got home and I couldn't get my Wi-Fi calling working (was previously not even an available option when I had AT&T - HUGE thank you to T-Mobile for giving this back to me). Error I received was "REG90: Unable to Connect." So, based on peabody58's advice, I went into a store and have them give me a new SIM. Once the new SIM was in there, it worked like a champ. My guess is that the SIM was registered with my temp number and wouldn't update to my ported number for some reason. Thus the error of Unable to Connect was due to the temp number not being authorized for anything other than calling/texting so it was more of an authentication error rather than an unable to connect error. Support was rather baffeled whenever I called so I kind of had to be forceful with the in-store help, but it got the job done. Hopefully this helps someone else too!

                                      • msanandres

                                        Re: Fixed REG90 cannot connect wifi calling

                                        Turn ON/OFF Airplane Mode.

                                        Reconnect to your WIFI

                                        Try the WIFI CALL SETTING again.

                                        This worked for me. 

                                         

                                        I always use WIFI CALLING ONLY when at my house since the cell signal is one bar or less.  The stupid phone will still try to connect calls via cell even though the signal is not strong enough for a useful conversation.

                                         

                                        Most of the advice I see about SIM cards etc. I suspect is totally unnecessary.  All you are doing is resetting your phone in some way that is more cheaply/quickly done through the phone software as I show above.