iPhone 12 losing service

My iPhone 12 Pro Max drops service and I get “IPhone is not activated, please contact carrier” anywhere from 10-30 times a day. Toggle the airplane mode and service reactivates. Apple gave me new phone, Verizon gave me new SIM, still not working. Have tried digital SIM. Happens mostly at home so not switching towers. Have spent about 12 hours over last few weeks with Apple/Verizon reps restoring, trying different settings to no avail. Sent screenshots to Apple, still no fix. Very frustrated.

****Update - switched from Verizon to Cspire. Phone had become practically unusable over last few days. It’s been over 24 hours now and same phone I was having problems with now works perfectly with new carrier.

Update: changed the cellular operator to another and the iPhone 12 Pro Max working fine!, there's no problem anymore.

Details: Country - Belarus. The previous cellular operator - Life, with it the iPhone is losing service. The new cellular operator - MTS, the iPhone works fine with it.

That’s what I have been saying. Now if you check your PRL number it want be a (1). It will have a series of numbers. Most likely 5 digits. Verizon told me and Apple said the PRL is not supposed to be a 1. 1 is the same number you get if you take the SIM card out. 1 is a disconnect number. PRL ( preferred roaming list) is how the phone connects to your carrier. If you don’t have the correct number it ain’t gonna connect. You can force it by toggling the airplane mode switch but when it loses signal it don’t know how to reconnect with out the correct number (PRL). Good luck, happy new year. Also Apple told me to return both of my phones because of this issue. So I did and got 2 Xr’s. Problem solved.

I returned my iPhone 12 Pro and got another one , besides loosing signal and dropping calls it was loosing internet connection, so they gave me another phone . So it took care of the internet problem but I was still dropping calls so I called Tech support again and he said to restore the phone to factory settings again so I did and never had a problem dropping calls again it works perfectly.

Just got off the phone with Verizon tier 2 support. They told me that they are waiting for Apple to fix this problem via software. They stated that Apple is starting rolling out iPhone 12 specific versions of iOS 14.3.1 based on build configurations. I haven’t seen an update past 14.3 yet. 

I had apple replace my red iPhone 12. They have to do diagnostic test first. Mine wasn’t reading sim yet the phones on display would. Replaced my phone and screen protector for free. Haven’t had any issues since. 5G doesn’t come up all the time but that’s not an issue for me as long as the phone works.

I am also with Verizon. Apple sent me a replacement phone that is open phone. I can go any carrier. Then I called Verizon to request a SIM card,. When I set up my physical SIM card, I told Verizon my problem. Then instead of setting one SIM card, they set up physical sim as primary , digital sim as 2ndary. I have not have problem since. So call Verizon and told them your problem and request a physical sim and sent up both sims to see if it helps. If not , need to call Apple to replace your phone.

No.

The iPhone 12 family of phones supports some additional LTE frequencies that older phones do not.

If the BTS tells the iPhone to use one of those frequencies but the tower itself has not been properly configured to use those frequencies, it will result in exactly what was described.

So for example, the iPhone 12 supports FDD-LTE bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 32, 66 and 71.

The iPhone 11 supports bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 29, 30, 66 and 71.

So a greatly simplified and unrealistic example would be:

You connect to the BTS, and it notes that you are in iPhone 12 and can use FDD-LTE band 28 so it assigns you to that frequency.

However, there is no antenna on the tower conected for FDD-LTE band 28.

Your iPhone 11 doesn't support the band so it would never notice.

Other phones may not notice.

Once assigned to band 28, your iPhone 12 would report "No Signal."

When you reboot your phone, you reconnect to the tower and this time the BTS says "use band 26."

Your iPhone 11 can use that band, your iPhone 12 can use that band, and everything reports full signal and works beautifully.

My wife was constantly having this issue when she was at work since picking her new iphone. A couple weeks ago Verizon did some work on the cell towers in the area...since then she has not had the issue. Another interesting thing is I have been having issues receiving calls at my home, straight to voicemail. Finally called Verizon since this last time nothing worked, reboot, airplane mode toggle, etc. They did something on their end and all worked shortly after. Not sure its related, both my wife and I have iPhone 12 Pro...Blue and black. Never had issues with the 11 Pro or X.

Apple has been able to do exactly that in a few cases, and Verizon has released some new carrier settings updates.

The issue is it costs money for Verizon to reconfigure the towers, as I suspect the work needs to be done by an actual person on-site, so at the moment it seems that they are only fixing towers they get a lot of complaints about.

More than one person on this and other threads has said Verizon made a change and their phone started working properly without any software update on the phone side.

I was wrong my case was the issue but not the only issue. They switched my sim which helped alittle. They told me to switch from 5G to lte in the cellular settings which also helped some. But the issue is still when I initially lose service somewhere I have to force it to come back (airplane mode off then on again) the problem is not fixed. Verizon told me I could switch my phone for another iPhone 12 Pro Max but that would most likely not fix the issue. I was told the issue will not be fixed until there is a software update. It is happening when the service is switching from one tower to another tower.

installed the 14.3 update and disabled 5G completely. No more dropping off Verizon when traveling as of today.

In my case, the issue has been fixed by 14.4

Thank you.

Apple should able to give you a replacement, call them and ask for one. They did replaced my. iPhone 12 Pro in blue. People is saying blue has the most trouble.