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Your findings are very similar to mine. I’m running Dual-Sim and the Xfinity Mobile service is on the Physical Sim and AT&T on eSIM. Xfinity is Secondary to AT&T line. AT&T is much more aggressive in switching into WiFi calling then Xfinity(AT&T’s WiFi calling also has no issues) however I thought it could possibly be a function of the fact that it was not true primary connection. I’ve been testing with WiFi calling turned on and it seems like it will all work as it should for about a week or so and then strange things like Failed Calls begin to occur and I’ll need to do the Airplane Mode / WiFi shuffle to get things working again. I have not needed to reset network settings to get things working again although I have done it to appease Technical support. In regards to placing the phone into airplane mode, XM WiFi pops up and WiFi calling works just fine, it’s when it needs to go between the towers and WiFi that something seems to get hung up at certain points and something doesn’t register or associate properly. Thanks for the post! I’m glad to hear you are not having the issue on the Samsung phone. ... View more

Just did some basic testing with VoLTE off and WiFi calling Enabled and it seems to work fine. I can toggle into and out of airplane mode without issue and without experiencing the Call Failed issues( these call failed issues I’m referring to are primarily inbound calls) when I go back into Cellular mode. The con to this approach is of course no Data while on a call while on the cellular network and no HD Voice to other capable folks. You will get HD voice to other capable folks while on WiFI calling though. So the issue seems to be a combination of WiFi calling when used in combination with VoLTE. Being that Verizon is moving away from CDMA I’d guess the better option is to just leave WiFi calling off until they sort out what’s going on. Unfortunately that’s not going to help the folks with questionable coverage. This is probably a conclusion that many folks have already come to but if the previous support threads are being archived or deleted it’s Ground Hog Day for those of us that are new to the Xfinity Mobile Service. It would be nice if someone from Xfinity Mobile would own the issue escalate it and get it fixed. There are much smaller MVNO’s that have this working, it’s really strange this has been such a long standing issue. ... View more

It’s very easy to reproduce time and again. Initially I thought it was only calls to and from other Xfinity/Verizon subscribers but that’s not the case. I can reproduce when I go into Airplane mode on the phone. Interestingly enough, while in Airplane Mode WiFi calling works just fine. The issue manifests when I leave airplane mode. The carrier correctly changes over to Xfinity Mobile from XM WiFi but it would seem that something in that re-registration back into the cellular network doesn’t quite work. It appears to be in cellular mode but behaves as if it’s in Limbo where it’s able to notify the phone that there is an incoming call but once it’s answered it goes to call failed until I go back into the settings and toggle the WiFi as well as toggling Airplane mode. I did some other testing earlier on where it seemed that it could also be related to VoLTE. So I may try some additional tests leaving WiFi calling on but turning off VoLTE(not sure if that will work or not). I find it a bit strange that this issue has persisted for so long especially since I haven’t seen this or even heard of such a pervasive issue on any other carrier, especially Verizon which if it was a network issue I’d expect it to manifest there as well. Leads me to believe it has to do with the carrier settings in how Xfinity is coding their WiFi calling rule sets or something. ... View more

This issue still persists on the Xfinity Mobile Network. I have this issue with multiple iPhones and have absolutely no wifi calling issues with the same phones on other carriers connecting to the same WiFi networks. I can eliminate the issue by turning off WiFi calling. There definitely seems to be an issue in how Xfinity Mobile is handling WiFi Calling on the iPhones in comparison to the other carriers. I’ve tested both T-Mobile and AT&T on the same phones. ... View more

Just to follow up on this in case anyone else is experiencing this issue. I ended up disabling WiFi calling on all of these devices and am no longer experiencing the Call Failed issues. So it seems like it may be related to the re-registration between the WiFi and Cellular networks. I did some additional searches on this and found that this ( Wifi calling causing call failed issues ) actually has been an issue for some time. ... View more

I realize that this thread may be a bit old but I have a similar sporadic issue. Background: iPhone 11 Pro - Unlocked AT&T Service on eSIM (Primary Voice and Data) Xfinity Mobile Service on Physical SIM (Secondary Voice and Data) Cellular Data Switching Enabled on both Lines. VoLTE enabled on both lines. WiFi Calling Enabled on both lines. iOS 13.3.1 Phones being called are all iPhones Dual SIM XS Max (T-Mobile Primary eSIM / Xfinity Secondary Physical) iPhone SE Xfinity Mobile iPhone 6 Plus Xfinity Mobile I’ve been encountering issues which seem to be related to VoLTE or some type of Data Network Registration delay or error when making calls on my Secondary.(Xfinity Line) Theses issues do not occur all of the time but often enough to take note. The issue manifests in a few different ways. I’ll make a call from my secondary( xfinity line ) to another number on the xfinity network while I am connected to the primary AT&T cellular network. When this happens my AT&T 5Ge icon drops and the Xfinity LTE icon pops up in the corner. ( I expect this ) The phone is dialing/ringing and from here i’ve noticed 3 outcomes. 1.). If everything works as it’s supposed to the call connects, the voice connection is notably an HD connection, the LTE icon persists in the upper right corner of the phone and browsing and other internet traffic passes while on the call. 2.) The phone dials and rings the other phone and when the other user attempts to pick up the Call is disconnected and the receiver gets the call failed pop up.. Depending on how quickly they acknowledge the call failed message the calling phone may actually retry the call(as I believe it fails over) and succeed but not as an VoLTE call as the LTE icon disappears and the voice quality is notably not HD and no Internet traffic passes. 3.). The phone dials and rings the other phone for a few rings and then the LTE icon disappears, (ring sound quality drops) and the call is sent over the regular cellular network, I’m guessing the CDMA network as it’s Xfinity/Verizon. Again, no cellular data during the call and no HD voice. When the LTE icon does disappear I’ve attempted to make a few other calls to see if it’s just an initial negotiation/registration delay but subsequent calls seem to just go over the regular cellular CDMA network and the LTE icon just disappears or maybe does not even come up after the initial call. I’ve been able to fix this by toggling the phone into and out of Airplane mode and then attempting to make the call again and then the LTE icons stays up in the corner and everything works as expected again until it doesn’t again. I realize that this is probably not a very typical phone configuration with the dual SIM setup but figured I would ask the forum to see if anyone else has experienced something like this and if anyone knows why this is happening and if there is a more permanent way to fix this. Thanks! ... View more