iOS 14 no signal, no cellular data

Update: ios 14.1 does not help. do not update. things getting worse on 14.1!
Update: ios 14.1 does not help. do not update. things getting worse on 14.1!
Update: ios 14.1 does not help. do not update. things getting worse on 14.1!
Update: ios 14.1 does not help. do not update. things getting worse on 14.1!
Update: ios 14.1 does not help. do not update. things getting worse on 14.1!

Solution

after many checks and trials of all kind for a month the issue was finally resolved by the restoration of ios 14.0.1 in DFU mode using Itunes. Recovery mode won’t work. It has to be DFU; Device Firmware Update mode which is the deepest firmware update mode that bypass Iboot unlike recovery mode that use iboot.

That’s the only solution that worked. Google or youtube how to force your device to DFU while connecting to itunes. Its simple with additional clicks and you are set.

DFU didn't work for me, still no cellural data.
Xr, bought in USA, used in Poland/EU

DFU did not work for me either.
I'm on roaming in spain with swedish sim but i also tried to DFU with a local sim in case there is some issues with registering the iphone or whatever. Didn't help though.
Prior to the DFU i applied for the beta program and upgraded to 14.2 Beta 2 which didn't help either. After that i downgraded to 14.0.1 which didn't help and then i DFU'd and reinstalled ios 14.0.1 even twice but it didn't help.
For a short while it worked on 3G but after a minute or so it stopped working there as well. Gah..

Would be nice if someone in the developer program could try 14.2 Beta 3 which was released yesterday (13th october) and see if that would help.

During my journey with this 14.0.1, I've tried also with DFU...but nothing. No activating e No signal.
Yesterday, after the Apple event for iphone 12, I've also tried to install the newest iOS 14.1, downloaded not with iTunes but using a direct link, and installed....nothing.
Today I've restored my Backup on a new iPhone SE (i've bought a new ones to get back my data)...updated from iOS 13.5 to iOS 14.0.1...perfect!
After 1 week i've been able to restore my backup on this new Iphone. Now I'm at the same point of when I had my iphone 7 with iOS 13.7....WOW!!! with a little difference....now my wallet is much lighter.
Cellular line is working perfectly also with a Carrier that is not a partner (Fastweb).
iPhone 7 with iOS 14.01 is still there, in a corner, totally useless...good only as door stop .
When Apple will fix the bugs affecting this udpate I'm quite sure that also my IPhone 7 will be working again.
Good luck

So I just installed iOS 14.2 Beta 3 on iPhone XS and it didn't solve my cellular signal issue. Haven't tried the DFU method as of yet as it only seemed to solve it for 1 person as yet. Guess I'll have to wait for the standard update.

I'm dumb and couldn't figure out how to edit my last reply so just going to post a full update of things I've tried, with new additions:

Device: iPhone X

I've tried:

• Airplane Mode

• Hard reset

• Network Settings Reset

• Factory Reset

• iTunes Reimaging with 14.0.1

• LTE Network Extender purchased and added to my network 2 feet from me

• Wifi calling, no airplane mode (call never goes through, just hangs forever)

• Wifi calling, airplane mode (call lasts 5 seconds to a minute before call failure and dropped)

• VoLTE on/off

• 3G on/off (LTE Network Extender doesn't help and 3G signal in my basement is non-existent so dead on arrival)

• Upgrading to the 14.2 beta iOS

• DFU restore to 14.0.1

As of today my phone is useless even in areas I used to have strong signal outside my house. Driving to the store where I used to have 4 bars of LTE, my strongest signal, even after a hard reboot, was a single bar of 1x -- not even strong enough to make a call or send a text. I refuse to have my solution be upgrading to a new iPhone when my phone has never been dropped or damaged in any way. If this isn't resolved soon I'm just going to get an Android. At least then when there are issues I can roll back to an old version of the OS and have a functional phone.

Going to chime in that I have the same problem. I do notice when WiFi is off, it does get connected to the cellular network once in a while. It is now sitting in the living room with only cellular and I will not be willing to move it somewhere and use my Macbook/iPad to respond to text. (This is super frustrating esp when we depend on text messages for two authentication factor). Time to reconsider the implementation of two authentication factor with text message with this release.

One quick question for you guys (and hoping Apple is reading and try to reproduce this). Are you using the eSIM or the physical sim card? mines' eSIM. (ATT)

I did call Apple and opened a ticket... few days before my AppleCare expired!

My iPhone is iPhone XS Max, 256 GB.

I am having the same issue with an iPhone XS on 14.0.1. I lose all cellular signal (0 bars . . . . . ) when there is no WiFi. If I am connected to WiFi my cellular service/strength is normal. I have to soft reset the phone and then will have service for a short period of time, then back to no service and a soft reset.

my wife’s iPhone 11 Pro max updated to 14.0.1 and is not having the same issues.

After further testing, it seemed as soon as it uses my cellular data service, it got disconnected. When I turned off cellular data, I now am able to use the WiFi and get ATT's text message. Im trying to reproduce this.

What seems to be working for me at this point, as someone else said, is to restrict it to 3G and turn off wifi-calls. Restart the phone and wait for a while. Now i'm able to receive and make calls.

DFU not working same issue

Update:

if you see a blank column at "General" -> "About" -> "Modem Firmware", you're in trouble. nothing can make the ****** intel modem work besides reboot. just keep rebooting until the version number show up, which means your intel modem can at least get initialized.

only when you see a version number out there, like "2.01.05", you have chance to get connected.

Hi!
I use iPhone 7, and I live in Russia but I am currently in Tunisia.
I have one sim card from each country.
I have to use my Russian sim card in Tunisia to receive sms from the bank, so it is extremely important to me (Russia currently has its borders closed). I used to switch sim cards constantly in Tunisia, and the Russian one, worked perfectly fine each time.
After updating to iOS 14.0.1, the Tunisian one works as usual, no change whatsoever, but the Russian one keeps getting me "No Service", like everyone else here (Yes roaming is on).
I tried:

• Airplane Mode

• Hard reset

• Soft reset

• Network Settings Reset

• Wifi calling on/off

• VoLTE on/off

• 3G on/off

• Checking "Modem Firmware"

Seeing how the Tunisian sim-card works perfectly fine, I'm starting to doubt that the problem is with the sim card itself. Maybe the update caused some sort of malfunction in the card itself? I'm no sim-card engineer, but has anyone tried getting a new sim-card for the same number?

Small update on my experiences so far. Upgraded to 14.2beta3... same issue when roaming, still no service if on 4G, I force it on 3G, connects can change for a 20ish min to 4G and have to redo. Still not roaming to O2 network but EE, when on EE it seems to connect but unable to make/receive calls (even on 3G), I have to force it to 3 and unable to force to O2 or Vodafone to make/receive calls.
Now back in Belgium it works ok on Base 4G, no no service, no need to force to 3G [Base sim]
iPhone XS