iPhone 12 losing service

There was a change to my plan when I ordered my phone and AT&T put a code on my account. It wasn’t clear why or what the code was only that it was an accident. To fix it they changed my plan and resent it which made my phone work. Then they changed it back and now I’m good.

Apple did send me a new phone. However, at the same time, Verizon also gave me a new SIM card since the new phone Apple sent was unlock phone, so without Verizon,s SIM card, could not work.

when I was setting up the new SIM card, I let Verizon know my phone,s problem of connection, then they set up my phone differently. It has primary and 2ndary. I have not have problem since.

So, try the new SIM card first and let them know your problem also. If still does not work, ask Apple to replace your phone.

I still seen the wireles sign without any bar, but my phone is still working.

It’s the phones. My 12 did same thing replaced it with another new 12 everything has worked perfect ever since. It’s not the service. Take your phone back and tell them to give you a new one if they refuse go to apple store they will run diagnostics on it and test it. Even if it passes and shows that it’s losing service they have to replace it. Replace the phone for a new one. Everyone has been saying it’s the service or it’s apple. It’s neither. Millions of these phones were manufactured. A lot have defects replace until you get a good one. Good luck

Hi guys,

I had the same issue ever since I brought the new phone. It was very frustrating but

IT IS FIXED !

long strong short, after tried everything, i got an apple genius bar appointment.

it was HARDWARE issue, which I believe is the same reason for most cases here.

They replaced it for free, as all iphone 12 is within the 2 years warranty, despite where you purchased it from.

I'm not happy with the fact that my brand new phone was malfunctioning.

But at least I can use it now, hope you all get it resolved.

I am Verizon. They need it ship you a physical SIM card plus Apple digital sim. They active both. When I told Verizon my issue, they activists SIM cards differently. It seems been working so far, 2 weeks so far.

I think I figured out how to fix my intermittent no signal/no sim iPhone 12 Pro on Verizon issue. TLDR: Erase iPhone and Setup as New. 

I was a long time AT&T customer who just switched to Verizon since I can see a Verizon 5Guwb cell site outside my window, plus there was nice trade-in value for my iPhone XS. 

Last week I convinced Apple to send me a replacement iPhone 12 Pro to help fix my no signal /no sim issue. I backed up my first iPhone 12 Pro, then had to update the new iPhone to 14.3, so I could restore the backup image on to the second 12 Pro. Using my original Verizon 5G sim, the new iPhone worked well for about five hours and then I started to see the no signal/no sim issue on the new phone. Bummer. 

Since I had two identical blue iPhone 12 Pro 512GB models, I decided to run a test on my first iPhone 12 Pro. I used iTunes to restore a clean copy of 14.3 on my first iPhone, inserted the Verizon 5G sim and manually setup the iPhone without using the backup image. 

Normally I could repro the no signal issue pretty much at will by turning off the phone and then turning it on again and watch it struggle to lock in on a cell signal, or by installing/uninstalling apps and seeing the signal start searching after the install/uninstall. 

With the first 12 Pro, now setup as new and on cellular only, the signal was solid when I turned the phone on and when installing/uninstalling apps. So far so good. 

To test overnight, I kept WiFi off and streamed a Twitch stream all night over cellular. When I woke up the stream was still going. Great. 

Since I had a replacement phone from Apple, my AppleCare switched automatically from the first 12 Pro to the second 12 Pro. So I need to setup as new on the second 12 Pro. So I proceeded to do the following:

1. Backup 2nd 12 Pro
2. Restore new backup on 1st 12 Pro, so we can view settings and apps when setting up 2nd 12 Pro from new. 
3. Erase 2nd 12 Pro
4. Insert Verizon 5G sim in 2nd 12 Pro and setup phone as new. I kept WiFi off during this step and the following steps to test out the cellular connection. 
5. Change settings and install apps as needed. 

So it’s been 24 hours since I setup my 2nd 12 Pro as new and I haven’t seen the no signal/no sim issue so far. I’ve been on cellular only most of the time. 

Apple can probably fix this in a future release. There’s some setting that gets transferred during the backup/restore process, that makes the no signal/no sim issue pop-up, that the following processes don’t clear as of 14.3.

1. Reset Network Settings
2. Reset All Settings 
3. Backup iPhone, Erase All Content and Settings, Restore from Backup

I previously tried the above three work-arounds and none of them worked.  But the following did work for me. YMMV

1. Erase All Content and Settings
2. Setup iPhone as new

I know it’s a PITA to setup as new, but it’s better than dealing with the no signal issue. 

To share logic and facts.

”Phones replaced multiple times with the same problem” - that’s a carrier issue.

I’ve stated several times, the issue is probably due to the use of a particular brand of cellular phone equipment that has errors in their firmware that cause this issue to manifest. AT&T apparently doesn’t commonly use that brand where Verizon and other carriers around the world do. Having worked in telecom in the past I am very aware of how such issues propagate.

For example, classic AT&T step by step and 5ESs switchgear would allow you to wait a minute or more between entering touch tone codes and the call would still complete.

One common vendor’s switchgear today will not complete the call if the delay between successive digits is more than a second.

The fun part is you never know which type of switch your phone line will be assigned to, but it doesn’t occur because your home phone is broken.

You state you are a VZW customer; visit an AT&T store and ask to pop a demo SIM into your phone and do nothing more than see if you get a “no signal” error over say 30 minutes in the store.

If nothing else, it would be another data point.

Just spoke to VZW engineer, said about another 30 days. Apple pushed updates in the 14.3 and 14.4 updates, however, things needed done at every tower in order to support the handoff from tower to tower. It is not backwards compatible to pickup a 3g signal it’s is only LTE and up. So when it cannot find the lte signal it doesn’t pickup the 3g.

I turned off 5G and just left on lte, data mode turned to standard, turned WiFi assist off. Restarted the phone, went every where I dropped calls and phone deactivated. No issues today. Engineer I spoke to said give it 30 days and should be resolved in the towers.

So many people reporting issues, and so much confusion about what's causing them. I live in Portland, OR, and I purchased two new iPhone 12's when they were first released. At home I had a weak signal that would drop calls, and I constantly had to toggle in and out of airplane mode to reconnect to Verizon. After many calls to Apple and Verizon, I finally sent an email to CEO Tim Cook. That was on a Friday. On Monday I got a call from a senior engineer who reviewed my logs. On Tuesday he called back to say they were flying an engineer up from Palo Alto. He arrived at my house at 5 pm that day, and took out 5 phones to run tests on my Verizon signal. He said that he believed that the Verizon towers were not configured correctly to choose the right signal band and the Apple engineers would contact Verizon to resolve the problem. On Wednesday afternoon I suddenly had two-three bars of signal strength, and I have not had a problem since.

hi

same here.

i fixed mine. i got an apple genius bar appointment.

they refused to replace the phone but they replaced some hardware (a port maybe?) in the back for free (its covered with every new phone). it works now.

I think we found a solution. Backup -> Restore iPhone (using Mac OS) -> Restore Backup. This reinstalls the firmware which is evidently the problem.

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.