iPhone 11 Pro Max 4G LTE Signal Issue

The new iPhone 11 Pro Max loses 4G signal from time to time (every a few minutes) when the Wi-Fi is off or no valid Wi-Fi hot spot is nearby.


Wi-Fi is off: The 4G signal drops to null in a sudden, and restores to full (4 bars) in 2-3 seconds. This happens regularly.

Wi-Fi is connected: The bars are steady - stay at 4 all the time.


I have tried:

  1. Disable Auto Network Selection
  2. Reset Network Settings
  3. Reset All Settings
  4. Reset All Content and Settings


None of them shows promising improvement.

iPhone XS

Posted on Sep 21, 2019 8:22 AM

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Question marked as Top-ranking reply

Posted on Sep 28, 2019 6:58 AM

I just got back from Apple Store and they swapped out my phone for a new one and the problem was fixed!!!


I would suggest doing these steps first before you go to Apple Store:


1) Call your cell company to debug first. Apple is going to say since it’s cell service issue and it’s not Apple problem. Cell company is going to go through list of debugging issues (reset network settings, etc) to see if that fixes your issues. If that doesn’t fix, continue debugging steps below.


2) Do a screen record of your phone dropping the cellular connection as evidence of you having issues just in case you’re in the Apple store and you can’t reproduce the issue.


3) Backup your phone. I used my laptop to backup because it restores much faster that way than going through WiFi.


4) Do a full wipe of your phone and set up your phone as a new phone (don’t restore from backup). This way you can see if your cellular issues are from software or from hardware.


4) Test our your phone and see if you are experiencing same issues.


5) If your cell connection is still dropping, take it into the Apple Store.


Good luck! I feel this is for sure a hardware issue for most people!

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364 replies

Oct 15, 2019 10:08 PM in response to David_Panda

One would think. I keep scanning the tech press for any mention of this and have found nothing. In the mean time, as I wait for a replacement from T-Mobile, (waiting for the same model to come back in stock, and hoping that a phone coming from a different lot does not have the bug) I am getting by with an old hand-me-down Moto X Android with the same SIM card. Only supports up to Android 7. Very inconvenient.

Oct 17, 2019 6:26 PM in response to VVii Tii

I was in Indonesia for 2 weeks and was using Telkomsel (GSM) with No issue. But it was running iOS 13.0


as soon as i got back to US, the issue occurred.. ( iOS 13.1 carrier Verizon) even after I disable VoLTE, even after i swap SIM.


my friend who sits next to me at work has same carrier, and same iOS version, but using iPhone X has no issue. So i dont think it’s carrier/network issue.


then I Updated to 13.2 Beta, carrier Verizon. The problem persist.


Signal receiver and iOS compatibility issues with CDMA ..? (i assume)


Now my iPhone Pro max running 13.2 beta with TMo (GSM) No issues.


Oct 19, 2019 10:04 PM in response to ming36

Same issue in Germany on Vodafone (which has one of the best reception here). iPhone 11 Pro, iOs 13.1.3


First I’ve thought this was my old SIM card so I’ve removed it and installed an eSIM profile. Same result. Barely 2 lines of 4G while in the middle of the city where my Goggle Pixel 3 has full coverage. Sometimes even if it shows full 4G bars, there is no actual data connection. Rebooting the phone or cycling the eSIM profile On/Off does the trick for about 30 seconds and then is gone again.


Oct 22, 2019 3:36 PM in response to robinhebert

I have had an xs max since October of 2018, so right at a year. Had all the problems discussed ever since buying it.

It's definitely (atleast partially) software related because back in the spring apple released an update that fixed it and was even part of the update description.

I went on to ios13 beta in the summer and the problem returned but it was only like once every 7-10 days. When the official ios13 came out and I switched it got tons worse and would happen 3-4 times every single day.

There is a work around though, if you turn of volte the problem ceases but it's a huge inconvenience as I use my phone for work and often need to talk on phone while also using data to lookup stuff.

I've talked with Apple recently and they just try to gey me to talk with Verizon and talk about sim card issues but its not sim card related.


At the end of the day I paid $1500 for a piece of crap. Was going to try to convince apple to swap it out for the 11pro max but Serna it's having problems too. What a joke.

Nov 15, 2019 10:12 AM in response to JackDougan

When I did this software update it seemed to be a little better, but I will still be in an area that historically had a great signal (with older iPhones) and my phone (11pro max) shows one bar and my call drops out and I lose the call. I have to put the phone in airplane mode for a few seconds or power cycle it and when it comes back I usually have signal again.

Dec 8, 2019 3:14 PM in response to ming36

I have this exact problem on Verizon. My phone will go up to 1 hour at a time where it has no data service. I’m also getting dropped calls all over the place. This can happen in a location where I normally have perfect LTE. My wife, also on Verizon, has no such issues with her iPhone X. Both are on latest iOS. Given what I’ve gone through, the only conclusion is a hardware or software defect with the 11 Pro.


None of the steps below fixed the problem. I’m planning to return the phone at this point:

  • Reset network settings
  • Reset and erase all settings/phone and setup as new phone
  • New SIM
  • Replace phone with a new iPhone 11 Pro


Mar 8, 2020 5:17 AM in response to ming36

I’m in the UK and bought a iPhone 11 Pro Max in February 2020 and since then having issues with data coverage once I am away from WiFi. Also when around WiFi I have to turn mobile data off before it connects. I contacted my service network provider and reset the network and data settings and it worked for few hours but once I got connected to the WiFi again the problem returned. My network provider said I should turn WiFi’s off when leak g the house but who wants to do that. Have to go in the phone each time and turn on and off settings. Furthermore, it doesn’t d]work either way. This time the reset doesn’t work. Seems there is a fault the new phones.

Mar 8, 2020 9:46 AM in response to Hereorthereorhere

[ iPhone 11 pro w/ Verizon in US ].  Specifically, what is going on is when I'm driving or simply in areas where the iPhone detects new WiFi signals that I'm not connected to (or haven't before) which of course is very often and, THAT's when things seize often times.  There is some malfunction that absolutely IS the phone where, I'll lose all ability to do anything in safari or ANYTHING that would require LTE or WiFi.  What cures it at that extreme moment it happens is turning off WiFi, or connecting to WiFi, then, things function again.  This is most certainly a malfunction where the cell's detecting other WiFi signals disables the LTE connection, even if many or full bars.  I've run many trials that basically proves this to be the case, with a small amount of times it's not reproducible.  This most certainly absolutely is the phone and not Verizon.  I am brand new to Apple; If this isn't fixed in an iOS update, I am absolutely going to be switching back to Android.  I'm not paying this premium price for a phone that is THIS unreliable

May 9, 2020 8:42 AM in response to Jdurkin107

In the US here with Verizon. Ok, I've figured out that there's some spots that predictably will have this odd/bad signal function despite full bars. For example, at home, I'm always fine, despite having 1 or 2 bars. A few towns over, where I work and hang out, I often have full LTE bars and yet the phone is crippled and loading a web page is like super slow dial up and calls drop CONSTANTLY and repeatedly. I'm convinced that there are certain spots where something is going on...maybe cross signals of other towers/interference of some sort? Either way, in this area, having absolute full bars and getting crippling service is intolerable. I'll have to move back to Android as it worked fine without this MAJOR issue.

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iPhone 11 Pro Max 4G LTE Signal Issue

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