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Schtibbie

macrumors 6502
Original poster
Jan 13, 2007
435
187
I *think* i've been seeing this since the 15.3 update on my iPhone 13. Austin TX area. AT&T. 5G Auto. At home on wifi i'm fine, but out and about anywhere in town, even with full bars, often cellular data will get "hung up". Safari won't load any page, other apps also can't connect. Force restarting apps themselves doesn't help. Rebooting the phone DOES fix it. So... is this definitely a 15.3 issue, or could still be AT&T issue (locally) that my phone is sensitive to? This also started around same time as AT&T allegedly started turning on c-band, though I don't actually have 5G+ in any part of Austin I have been to.
 
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Schtibbie

macrumors 6502
Original poster
Jan 13, 2007
435
187
Have you tried forcing LTE just to see if you still get the hang?

Yeah even that didn't work, which is surprising. What i've tried now is "reset network settings", which is a thing I hear about on these forums as a magic elixir but i have NEVER had to do that in all my years with an iphone (since the 4). I'll see how it works out and about today and report back here. The lack of similar complaints here makes me think this is just my device/os acting way.
 

Truefan31

macrumors 68040
Aug 25, 2012
3,587
835
It’s not just you. I’m on tmobile and I find it’ll hang up sometimes. On 5G.

I use dual sim with Verizon. When I switch back n forth it’ll hang up too sometimes.
 

magicMac

macrumors 6502a
Apr 13, 2010
999
419
UK
I was having an issue with the same symptoms - great signal but no data / nothing loading. It was happening nearly all the time on my iPhone 12 pro on o2-uk, pretty much any location I went to. found myself constantly rebooting phone, or going into airplane mode, waiting a few seconds then going out of airplane mode normally fixed. o2 adamant it was phone issue and nothing wrong with their network or my account. Tried all releases of iOS 14 since the 12 launch, beta /non-beta, resettings network settings, changing APN details, then going to iOS 15 - which also didn't fix. I was incredibly frustrated and could only assume my iPhone 12 had a faulty modem...

So I eventually replaced phone for iPhone 13 mini on iOS 15 when it came out, expecting it to fix the issue BUT NO! still had the issue - still on o2. eventually o2 let me leave my sim only contract, I went to VOXI / vodafone and issue disappears. Defiantly something to do with how some networks have configured something in some areas.

When I look on twitter there are defiantly people with exact same issue with me, mostly in the US, but also many people on o2 in the UK in certain regions, and now I see this thread also.

I never got to the bottom of it - seems like some very specific carrier configuration that upsets the x55 / x60 modems in the iPhone 12 / 13. Perhaps something to do with the carrier aggregation / mix of TDD and FDD, or related to switching from mast to mast so many times, not really sure what triggered it. Try a SIM on another network, I bet it fixes it.
 
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Schtibbie

macrumors 6502
Original poster
Jan 13, 2007
435
187
Couple of entries in the 15.3 thread.
13 ProMax AT&T - this version seems to have an issue for a few of us.

OP here. I was able to MAYBE fix it by doing the reset all network settings thing and rebooting. Since that last reboot I have had OK cellular data. But I gotta watch it for a few days and see if it hangs up again.
 
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