Phone randomly loses cellular service

Hello user_917dc7, thank you for taking the time out of your busy day to write us here in regard to moms phone. We would love to help you get her issue resolved. For further assistance please reach out directly to Xfinity Mobile team. The expert mobile team can be reached at 1-888-936-4968. They are available 24 hours/day, seven days/week. You can also reach out using this link https://comca.st/3CKnZdO. Scroll down to the bottom of the support page and click "Ask Xfinity". If you have any further questions or concerns, please don't hesitate to reach out.

I have an iPhone XR and started having the same issue after upgrading to iOS 16. I have to do a network reset in order to get back the connectivity. After the last network reset, I did not turn on the Wi-Fi calling and  so far so good. The issue is that I need Wi-Fi calling because the cellular reception at my house is super weak. 
On my phone it says xfinity Wi-Fi calling so my thinking right now is that the WiFi calling causes this issue. 
Will update if i lose network connectivity even without Wi-Fi calling being turned on. If this workaround works then xfinity team needs to look into the WiFi calling code. 

I have all the same issues and have tried all the same troubleshooting never had any issues up until a few months ago started out of nowhere.. costumer service is a joke, they are useless and seems they know less than I do... going to try the suggestions of dave03 below🤞 . Will probably change carriers if that doesn't help.

Has this issues been resolved. I’m having the same issues. In areas where I had service in the past I now have none. Where I should she bars of service what I see is SOS. When I do have bar that say 4G or LTE, forget about it, it might as well show the SOS message because I can’t make a call, get online, or even send a picture message. Why has my service degraded so drastically over the past month? 

My phone is not even usable as a phone. If the calls go through they are either dropped or if I move my head an inch they cannot hear me or I am robotic and then calls are dropped. I have a Google Pixel Pro 7 since end of November 2022 and have had a Samsung previously with xfinity and had decent service/reception but it is horrible now. I have spent hours with customer service and they are horrible and do not help at all. Two separate times they said they would send a new sim card and neither one even sent it as the next customer support person informed me there were no  sim orders placed by their CS/tech agents. After reading this forum, it appears a sim card wouldn't have helped anyway, but it's the xfinity network that is subpar.

• I have it switched on wifi calling- still doesn't work.
• I've disabled 5g and 2g, still no help
• Have reset phone and network 2x with tech, no change.
• There has been no water or other damage to my phone

Same problem here, I have iPhone XS Max and have called twice in the last two weeks to resolve and nothing helped. When I was traveling to Oregon it took 20  mins to get out of SOS, I couldn't do anything with the phone. When I go to the office I have to make sure I have wifi on or I don't get any notifications or calls, I have no bars just wifi, if I turn off wifi I get SOS only. They have "reprovisioned" and reset network and now I've gone to the Xfinity store and they put in a new sim card but today I am getting the SOS if not on wifi. I never had this issue when I was with Verizon, seriously considering change back to Verizon - I was lied to when I signed up for Xfinity mobile, I was told this is a better carrier because they own the Verizon towers and I would have better service. 

My post was lost in the sign in process I guess... one more try

I am having something very similar to this issue on my iPhone8.   Much of the time outside of the home now, I see "No Service" or 0 bars of service but still have the Xfinity name.  I have never had any sort of reception issues up until now.  

A second issue that has showed up at basically the same time as this is I will see full bars cell signal and any data related thing I try to access gets a message "Could not activate the cellular network"

I havent had any updates to the phone iOS wise so this appears to be some sort of change on the network side with Xfinity and/or Verizon

Repeated fails to access Xfinity network started today after a week of service with Samsung A22. Phone displayed "not registered on network". This problem has persisted after hours on phone multiple times with Xfinity service. For the last hour calls have worked but not SMS. What's going at Xfinity network switches? 

I am having this same issue and don't like it one bit because my daughter lives in NY and I prefer she has signal and is able to call/text in case of an emergency. I'm wondering if it's an issue with Xfinity using Verizon's network. Maybe Verizon's customers come first and if there's no signal left for Xfinity customers, they lose it. 

Same problem with my IPhone 12 Pro Max that I purchased from Xfinity Mobile, seemed to have started shortly after paying it off, Best signal I ever get now is 2 bars (usually more like 1 bar most of the time). I think they are doing this to force you to buy a new phone from them with the worst pricing of any carrier, they never have any decent phone offers or any buy one get one free offers like most major carriers have and do

:( plus seems like there data has always been slow

There are hundreds of customers with the same issues. I just started having the same issue.

Xfinity doesn't seem to have an answer, acknowledge a problem, or be willing to investigate further. It may be time to consider legal action. 

I have posted in this thread and have some updates to share.

I was starting to have 0 or 1 bar of service quite often.  Then a billing issue on top of that.  So I called in and the billing issue needed a 2nd level support to resolve.  While working with this agent - who seemed like he was actually on top of things - I complained about basically having no service most of time, noting that these are services areas that used to never have problems.

This agent said the problem was I was on a 'Gen2' billing plan which was the $12/GB.  He said upgrading to a 'Gen4' plan would fix this signal issue.  Gen4 was the $30/3GB plan.  Initially after the change I did feel like it was improved.  But its not been consistent.  I still get the 0 to 1 bar and the dreaded "cannot activate cellular network" with 3 or 4 bars. 

What does seem to help is to turn of Wifi and reboot.  I immediately come back with more signal than before the reboot and the signal is legitimately there for voice & data. 

I am having the same issue on my phone as well as my son's phone. I have a Samsung and he has an IPhone 14. The only way we can make calls is on WiFi calling at home. If we leave home, we will not be able to make calls for about 20 minutes or until we are out of the area closer to our home. This is insane and no XM does not have an answer. I have called 3 times. The only thing they keep saying is it will be fixed in 24 hours. I was going to stay with them until this happened. I am going over to Verizon on my line. XM does not have any answers. I am all for the legal actions here. I really feel like I am being ripped especially since this issue is happening on both phones at the same time..."NO INTERNET CONNECTION". We have reset the network settings, rebooted the phone, etc. Something is not right. 

Me too! My phone went into SOS mode the other day and it was really scary being unable to call family members to let them know I was ok. I live out of state on my own, and not being able to call or text someone, especially since I'm a young woman, is extremely dangerous. I hate Xfinity with a passion. My phone has essentially been messed up since 2021, [Edited: "Inflammatory"]. I used to get at least 10 spam calls a day, but since I worked in sales at the time, I had to pick up every time in case it was important. I've talked to the [Edited: "Inflammatory"] reps multiple times [Edited: "Inflammatory"]. Some things never change!