Can't receive data when on 5G UC

I have a T-Mobile Samsung S21 5G.  Same problem.  Normal drive back and forth to my property and even my calls drop whenever my band changes to 5G UC in two spots along the highway.  UC stands for Ultra Capacity regardless of what customer service says.  I can run a speed test when on 5G UC and download at 300Mbps.  Upload at 10.  But cannot use internet, cannot text, cannot make calls.  Makes no sense.  They want you to see how fast it is with a speedtest but then block you from using it for normal purposes.  

Having same issue with S21 Ultra. Anyone find a resolution? 

5G UC T-Mobile's "Ultra Capacity" network technically includes high-band 5G. The range of the higher bands are much more limited (1 mile radius) than mid and lower bands and some phones may not handle the higher mm bands very well. The mid band delivery makes more sense but still the 2-3 mile range and penetration could be sketchy. With the T-Mobile solution it appears the UC could appear when connecting to the mid-band mm or high-band mm network but probably the mid-band mm network. Since the radius of delivery for a mid-band mm frequency is not that broad (2-3 miles) it seems the delivery for mobile customers in transit is probably be a bit problematic. The lower "5G NR" T-Mobile solution has better range and penetration so is more forgiving. The solution seems to be more towers and more uniform coverage. It is not there yet. Just my take. 

The lower "5G NR" T-Mobile solution has better range and penetration so is more forgiving. The solution seems to be more towers and more uniform coverage. It is not there yet. Sorry but with technology has going pains. 

I saw a post where the suggestion to resolve the data issue when seeing the 5G UC is to revert to LTE. On the 5G capable iPhone go to Settings > Cellular > Cellular Data Options > Voice & Data and then set LTE vs 5G On or 5G Auto. That should work for an iPhone. I don't have the Android but I am pretty sure the same approach should work. Set the phone to use LTE for data when the 5G UC results in no proper data delivery. I have been there and experience the same issue with my iPhone 12 Pro. It is a bother.

Hi Jimmy, what you are experiencing is a sim issue, it's unfortunate right now with all the modernization of the towers,  but rest assured there is a fix.  You'll need to switch from the esim to psim (physical sim). We've noticed this issue with all Apple Devices with dual sims. If you're device doesn't have a physical sim, just drop by aT-Mobile retail store and pick up one.  They will be happy to make the switch for you.  No need to use it for a paperweight.  Hope this helps.  

VLloyd wrote:

Hi Jimmy, what you are experiencing is a sim issue, it's unfortunate right now with all the modernization of the towers,  but rest assured there is a fix.  You'll need to switch from the esim to psim (physical sim). We've noticed this issue with all Apple Devices with dual sims. If you're device doesn't have a physical sim, just drop by aT-Mobile retail store and pick up one.  They will be happy to make the switch for you.  No need to use it for a paperweight.  Hope this helps.  

I wish that were the case but neither device is on e-sim or dual capable and on separate lines. TabS8+5G has new sim and had them send new one for Note 10+5G since the original was over 2 years. Not sure about tower modernization either since it's been this way over a year but even worse the last couple months. Tech says nothing going on with towers in this area and with the coverage they see it doesn't make sense. New Tablet vs older 5G phone shows minimal speed difference but going for the S22 Ultra to test because of better 5G tech inside. I can detect mmWave signals but it's not off of my tower which is a tease but do get 4+bars 5GUC on tablet all day long. I know I can get slightly stronger data signals on 5G bands out here but band selector cannot lock them in. Phone steps in and constantly forces me back to band 2 and 66 which are always the weaker signal. Going to test the Hi-boost 10k pro signal booster to see if it makes any difference in data on the LTE signals out here. If I can get - 80 to - 100dbm at least it would be better than - 100 to - 120dbm. 

ScottMetzel wrote:

I had a similar problem come up in the last month and a half. I'm on an iPhone and was running iOS 15.6, and 15.5 before it, when I stopped receiving texts intermittently. Sending always worked.

I narrowed it down to 5G; if I was on 5G, texts would stop. On 5G UC or LTE, they'd come through.

Restarting seemed to help, but in the end, what’s worked 100% of the time was removing the plan from my phone entirely, then I reactivated it.

Now the phone seems to join 5G UC and WiFi calling more often, receiving texts just works, and I’m still using the same eSIM as before.

Hey Scott, you can read my update above but I do wonder what you mean by "removing the plan from your phone". What does that mean and do you know how that affects your phone? Just curious, never heard anyone say that. Thanks in advance. 

Jimmy

I just sent an email to Neville Ray the CTO  of T-Mobile neville.ray@t-mobile.com of and the regional Engineer about this issue. Will let you know if I hear anything back. I have provided Neville Ray's email if anyone else wants to contact him.

I have been having the exact same issue on my iPhone 14 Pro and two other iPhones. Furthermore even switching to LTE is not consistent. I contacted tech support many times in the last few days - all I am hearing is engg team has a ticket open and they are working - 24 - 48 Hrs ETA - this is as good as no ETA :|.

Here is a pattern I noticed - when the phone goes into sleep mode - to save battery if I not mistaken, the cellular data radios operate at low power - when you wake up the phone - typically unlocking or tapping on the home screen, that's when it does not connect back to the tower. For me I am forced to turn on Airplane mode and turn in off and even then, data only works on LTE. This issue started in the last 10 days - perhaps some upgrade/change is not really helping. I dont mind slower speeds - but inconsistent data - is just not acceptable.