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I have spoken to both Verizon and Apple about this issue. They both point to the other as the root cause. What I observe is that when switching between 5G and LTE sites sometimes the iPhone 12 Mini seems to forget to enable scanning for cellular service. If you toggle Airplane mode off and back on it scans immediately and reconnects. Of course unless you notice that you have no bars you could be offline a while without even knowing it. It was suggested by one of Apple or Verizon that I disable 5G but this sort of defeats why I bought the phone.
 
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This is likely a baseband crash. Sometimes (usually) the modem should reboot and service should come back, but the Airplane Mode toggle seems to indicate it's not always recovering cleanly. Will likely clear up over time as baseband bugs are tackled and fixes roll out in future iOS updates. (I don't think the baseband has a separate/silent update OTA mechanism in iOS.)
 
software update could fix this.. I lost count the number of times people had cellular issues when new models were released
 
Not reading all these but my 12 pro max on ATT would go to No Service while driving. Airplane mode toggling doesn’t fix it. I have to turn off and on which is dangerous while driving. So I have to pull over or get off the freeway to turn the phone off and on. Then it works.
 
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This is likely a baseband crash. Sometimes (usually) the modem should reboot and service should come back, but the Airplane Mode toggle seems to indicate it's not always recovering cleanly. Will likely clear up over time as baseband bugs are tackled and fixes roll out in future iOS updates. (I don't think the baseband has a separate/silent update OTA mechanism in iOS.)
I have offloaded the iOS log using Xcode and I do note a few crashes related to the "modem" so you could be right.
 
I can't help but wonder if Apple did something to these modems. I'm suspicious because I got the Intel iPhone 7 Plus and the Qualcomm version was stunted intentionally by Apple to try to match Intel. So I know they are capable of doing something like this and it's frustrating.
 
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I've had persistent issues with maintaining a cellular signal since the day I received my iPhone 12 Pro Max. What you're stating does not track with reports by dozens of users in the Macrumors and Apple Support forum thread.

The issue is independent to location, settings, etc ... I've ruled out location by travelling within a 200 mile radius since launch, the dropped cellular issue happens everywhere I go within the T-Mobile coverage area. My previous iPhone 11 Pro had zero T-Mobile network issues, and my family's other iPhone XR's are still connecting and staying connected to T-Mobile with zero issues. Even disabling 5G doesn't help.

Settings can also be ruled out ... the issue still happens on a iPhone 12 Pro Max when setting it up as a new iPhone, after resetting network settings, and even after a DFU restore.

But the biggest evidence that you're take is wrong is that for most users there's a 100% consistent reproducible test case. Simply go to Settings->Cellular, wait about 10 seconds, and your cellular connection will drop and reconnect. I was able to show the issue happen on demand to Apple Support while screen sharing dozens of times over the past few calls with support.

I don't know what other external factors you're referring to other that location and settings, but from where I stand ... the issue looks to be related to either faulty hardware on some but not all iPhone 12 Pros, a bug in iOS, an issue requiring a carrier and/or modem firmware update, or a combination of any of the previously listed factors. Exactly how is that not newsworthy?
I'm not ignoring that some people may have defective hardware...but it's going to be very small. This isn't a massive hardware issue, design flaw, or something that is newsworthy. If it were, everyone would complain and it would be on the front page every day. It's still anecdotal. Apple sells a lot of products.

Most likely, it's software related that impacts certain phones in certain situations.
 
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Like anything some phones have faulkts from new some dont. I remember people complaining about Intel and I think it was the 7 dropping calls or the XR I cant remember, but Ive seen this before in every launch. I have to say so far no drops on EE in the UK with a sim free model, but that does not negate those having the issue. I'm sure firmware updates and carrier updates will improve things, but Apple did go with their own design for the antenna not Qualcomm's. I do find it ironic that those that hated Intel modems now dislike the Qualcomm modem. Anyway to those having the issue I hope a fix comes along soon, same with the green tint too which I'm also not seeing on my iPhone 12 Pro. With so many phones produced there are bound to be issues, just look at the PS5 and Xbox launch and those issues some are having. 2020 has not been a good year for new tech.
 
This is likely a baseband crash. Sometimes (usually) the modem should reboot and service should come back, but the Airplane Mode toggle seems to indicate it's not always recovering cleanly. Will likely clear up over time as baseband bugs are tackled and fixes roll out in future iOS updates. (I don't think the baseband has a separate/silent update OTA mechanism in iOS.)
Could -possibly- mobile carrier updates fix (some of) this without an iOS update?
 
Glad I stayed with my iPhone 8
When Apple transitioned from Qualcomm to Intel, and had a mixed-bag of modems in 2017 with the iPhone X, there were initial connectivity issues with the handsets using the intel modem. This was ironed-out. 🐛

Seems we’re there again... now with Qualcomm being the 💩!! 😂

Inconvenience and work time lost while manually fiddling with toggling Airplane mode, etc....

they’ll fix it... right? 👻
 
Like anything some phones have faulkts from new some dont. I remember people complaining about Intel and I think it was the 7 dropping calls or the XR I cant remember, but Ive seen this before in every launch. I have to say so far no drops on EE in the UK with a sim free model, but that does not negate those having the issue. I'm sure firmware updates and carrier updates will improve things, but Apple did go with their own design for the antenna not Qualcomm's. I do find it ironic that those that hated Intel modems now dislike the Qualcomm modem. Anyway to those having the issue I hope a fix comes along soon, same with the green tint too which I'm also not seeing on my iPhone 12 Pro. With so many phones produced there are bound to be issues, just look at the PS5 and Xbox launch and those issues some are having. 2020 has not been a good year for new tech.
Yep, 2020
 

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This is something I have experienced day one. The service drops randomly and sometimes I have to restart the phone or turn airplay off and on to get this to work. It is very frustrating and I have reported it to Apple and after going through removing sim, replacing sim, checking for cellular update (not there), resetting network settings if it happens again check with carrier. This is not a carrier issue, because it drops not just cellular data, but also wireless. Screenshot shows I was on cellular and wireless here and lost all connectivity. Sometimes network speeds to update twitter feed or email lags when you go to check and that is when you realize that cellular wireless is doing something funky. This is hardware/software issue written all over it. This needs to be addressed by apple and owned by apple ASAP.
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My 12 pro does it. It just did it a min ago. Im on 5G in my office, it drops all signal, stays on the dots for about 5 seconds, then climbs up through LTE and then to 5G. Its only happened a few times, but I wasnt moving or doing anything, just sitting in my office reading an email.
 
I just noticed that if you are on a call, you can not force the phone to another cellular mode through cellular settings. 5G to LTE and vice versa. I wonder if this is why we get dropped calls. As if the phone isn't capable of switching during a call, which would be preposterous.
 
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I just noticed that if you are on a call, you can not force the phone to another cellular mode through cellular settings. 5G to LTE and vice versa. I wonder if this is why we get dropped calls. As if the phone isn't capable of switching during a call, which would be preposterous.
It’s the baseband crashing!!
Hopefully iOS engineering will STOP beta testing the masses!!! :oops:
 
12PM on ATT. I bought two on launch. Both barely manage to stay on LTE. Most of the time they drop down to 3g. My 11PM consistently has full bars so it’s not a carrier issue. At the moment, i have no signal of any kind. Ive been stuck on wifi only for the last two days.
 
12PM on ATT. I bought two on launch. Both barely manage to stay on LTE. Most of the time they drop down to 3g. My 11PM consistently has full bars so it’s not a carrier issue. At the moment, i have no signal of any kind. Ive been stuck on wifi only for the last two days.
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