iPhone 11 Pro intermittent cellular connectivity issue

My issue seems to have been resolved now. I went to the Apple store - hoping for a replacement phone. Instead, they tested the phone and did not find any hardware issues. They said that they needed to wipe and reload the phone - using iTunes - not the standard Reset from the phone. That is a very important distinction. Also, they said that I should not do a restore of my apps and data - rather, I should download each app that I needed and reconfigure each one. They did restore my contacts and photos after reloading the phone. It's been over a week now with no failures - no LTE connection drops - life is good. ;)

In the end I demanded a replacement phone and have had no issues since getting my replacement iPhone 11pro

I did work with 5 senior advisors and some other tech guy but after 3 weeks they told me the next step would be to wait 5-7 business days to hear back from their tech people I said NOPE. I told them I had been patient and I had tried to work through their layers of support and I was done. But my new one has not had an issue since I got it 2 weeks ago

Finally my issue is resolved by getting a replacement phone from Apple and set up as new phone. Did not restore from iCloud.

Good afternoon Changren Yong,

Welcome to the Apple Support Communities!

I understand you have encountered intermittent dropped calls with the iPhone 11 Pro using T-Mobile. iOS 13.1.2 was released September 30. If you have not done so already, please update your iPhone to the most recent version and check to see if there is an update from your cellular provider as well. Restart your iPhone after the updates to refresh the network connection. Then go to Settings > General > Reset > Reset Network Settings - Please note that this also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that were used before.

Update your iPhone, iPad, or iPod touch

Update your carrier settings on your iPhone or iPad

Take care.

Yes, I also have a Pro Max on Verizon - and the Apple store in Dallas resolves my issue by using iTunes to wipe the phone - then, manually reload apps and reconfigure everything - do not use iCloud or iTunes to reload the apps. Every since they did that, I have not had any issues - for several months.

same problem here in France with an brand new iphone 11. I had to shout at apple for them to take it back, because they said the analysis they run via software was all good. I was very upset because the phone was 2 months old. So i shouted and them wich is the only way in our declining society (and they were NOT NICE neither Professional), and said I wanted to send it back to them for some real guy to tcheck it rather than a failed software analysis. they send me a UPS guy to pick it up finally. 2 hours after the faulty phone reached them, i had a message saying they were sending me a new unit! the new one works fine but they go to much quiet with those problems and it's a shame you have to negociate ione hour with them on the phone to send back a faulty unit under guarantee.... plus i had to buy a new belkin Wireless charger just to charge my 11 PRO because they made sure none of the ones working (had a great UGREEEN unit)with you X and XS work on the 11pro . that's a lot of things for such a high priced phone.... :(

I reset network settings, then updated to the iOS 13.4 and the major connectivity issue seems resolved, at least, initially here. The true test will be when I'm in places where the cell will be detecting other wifi signals that I've not connected to before but, with COVID, I've not really been out anywhere. We'll see. Fingers crossed. At least in the car when driving, seems to not be seizing like it was before.

Since the day I got my 11 Pro Max, I’ve been unable to get LTE (or 5GE, as AT&T calls it) almost anywhere. In the rare instances that I do get a connection, as soon as I enter a building, it’s gone.

My first step in trying to resolve this was to call AT&T, but they immediately told me that they had already gotten “thousands” of calls about this issue with the 11. He didn’t specify Pro or Pro Max, he just said 11, but “thousands” was the word he used, which I’m assuming (hoping) was hyperbole. He said there was nothing they could do and that I needed to go to Apple.

I brought it to the Apple Genius Bar and they replaced my SIM card, but that did nothing. So I made another Genius Bar appointment, and they replaced my phone. I’m sorry to say, however, that the new phone has exactly the same problem.

In cases where I really need to use cellular data (because there’s no Wi-Fi available), I turn off Enable LTE in Settings, but that works only slightly better. Then, after a short period of time, it no longer works at all, and I have to restart my phone.

So I made yet another Genius Bar appointment, but the person with whom I met basically blamed it on AT&T and said I need to deal with them. (I pointed out that that’s where I began, and that they sent me to Apple, but that meant nothing to him.) He claimed that he wasn’t aware of this being a widespread issue. I pointed out that there are additional pages dedicated to it on the discussion forums every day, but he completely dismissed that.

So now I have a $1,600 phone that only connects to data on Wi-Fi.  I’m going to wait until iOS 13.2 is released and, if the issue persists after updating, I’m going back to the Genius Bar and demanding a new phone (the last guy I dealt with wouldn’t even consider it), since some people have seen the problem resolved with a replacement.

I bought the original iPhone, and I’ve upgraded every year since. I’ve never had a major problem like this with any prior phone, so this situation is extremely disappointing, to say the very least.

I was having the same problems with my iPhone 11 Pro! Several times I could hear the other side of the line, but they could not hear me. I couldn't even "Press 3 to speak to someone" when I called for help. I spent HOURS on the phone with both Apple Support and AT&T. (They both claimed it was a temporary network problem.) From the looks of these comments and all of the different providers, this is not a cellular carrier problem. We reset and rebooted everything. After several days, I finally went to the Genius Bar and was essentially told that there was no solution. I returned my phone to AT&T (because it was within 14 days) and bought another phone from Apple. It seems to be working okay for now...for whatever reason...fingers crossed.

I have the 11 pro (not max) w/ Verizon in the US. Specifically, what I really think is going on is when I'm driving or in areas where the iPhone detects new WiFi signals that I'm not connected to or haven't before, 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.

Try updating to 13.3. Resolved issue for me.

I have this exact problem on Verizon. My phone will go up to 1 hour at a time where it has no data service. 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