iOS 26 Cellular doesn't work after update

What finally worked for me was signing out of my Apple ID, rebooting the phone (did a full reset which is annoying but worked), then signing into WiFi and inputting my Apple ID. Finally back online.

Lockdown mode off.

This worked for me exclusively.

(16 Pro Max, 26.0.1)

so yes, solution, switch your physical sim to the 2nd tray. If you only have one tray, do the rollback to 18. You can find info on YT. If you’re exclusively eSIM, I wish you all the best.

does this mean I lost the ability to use 2 sim? Maybe. I don’t have a 2nd sim to try.

i wld hv stayed on 18, but my watch is 26, and no option to roll back.

[Edited by Moderator]

So drove 50 miles each way to an Apple authorised repairer. Was told my UK 14 Pro Max has a USA 5g modem fitted to so probably a US spec phone. So EU region 26 update hasn’t talked to modem properly. Found a file to downgrade to 18.6.2 but was immediately forced to upgrade to 26 again as part of the install process so I’m back to square one. I’m taking it up with the retailer and in the meantime have ordered a replacement! I love it that Apple just works 😟😟😟

Hello,

This could help restore your mobile data issue but not call failed issue on IPhone 14 Pro Max

1-Switch off the phone.

2-Remove the SIM card while the phone is off

3-Switch on the phone again without connecting to any wifi

insert the SIM card

Gemmafromga wrote:

WHAT WORKED. I’d love to know…..

This is what the post you replied to said:

Try flipping your sim to the other side of the tray, it worked

Apple doesn't read here in this user-to-user forum for feedback or suggestions. You can, however, let them know your thoughts here:

Product Feedback - Apple

I agree with your point related to SIM.

That's the action I will take as a workaround: replace the SIM/ switch to another service provider.

But, to me, it is a bug of Apple's iOS 26.1.

Because this issue crashed my whole phone.

As I mentioned in previous reply, the cellular/ Wifi/ Bluetooth all not working because of this bug.

Even though I restart the phone without any SIM card plugged in, the system still crashed with the status of "Searching for a network".

The system is basically hanged at the backend and keep searching for service.

And when I went to Genius Bar to do a diagnosis check, it showed all red on my cellular/ Wifi/ Bluetooth module.

However, when we restored the phone to factory setting, all working fine and the 2nd diagnosis check showed everything green.

(Until I plug back the problem SIM card)

I accept the statement that old SIM card might not be applicable to newer iOS but I don't except this kind of incident happen.

Plus, I updated frm iOS 26.0.1 to 26.1, which the SIM card working completely fine before the update.

It is obviously a bug haven't been fully fixed since iOS 26.

(though it was claimed fixed during 26.0.1)

I don't expect an adaptability on SIM card change within a small patch, not a whole version update.

Hope this makes sense.

Try flipping your sim to the other side of the tray, it worked for me

Have you talked to your cellular service provider? Inserting a SIM card should not cause issues less there’s an issue with the SIM card or the service providers software and firmware on your device.

Exactly the same with me on 14 Pro Max I tried all the usual suggestions and the actions you mention Apple did a remote diagnostic and said ‘it shows there's an issue with the cellular components of the device so in this case we'll continue with a service option to get your iPhone working properly as soon as possible’. I’m not convinced that I’m not going to have a 100 mile round trip wasted looking at hardware when it’s an update issue. Debating a factory reset via a Mac

i have same Model. I also tried almost everything even Apple support said this is a hardware issue. But i solved it by myself. What work for me:

remove sim card and turn it from back side and insert again.it works 100 percent

Hassan070 wrote:

i have same Model. I also tried almost everything even Apple support said this is a hardware issue. But i solved it by myself. What work for me:

remove sim card and turn it from back side and insert again.it works 100 percent

Works for your phone in your country. What model of 14 pro? What country are you in?

or do you mean you had it in back to front?

s.pam wrote:

Right so the sim tray thing won’t work either. I haven’t ruled out trimming the SIM card but I’m pretty hesitant to resort to this. Genius appointment is for tomorrow morning but I haven’t got high hopes from what people have said on this thread.

This so called fix of trimming the SIM card would, if it worked, indicate damaged contacts inside the phone. May work for some, may cause new unrepairable damage in others.

Far better would be to migrate to eSIM if your provider supports it.

IdrisSeabright

Is right, my brother's iPhone 11, after updating to iOS 26.0.1, didn't make or receive calls, until he checked the lockdown was already turned on, he turned it off, and the phone worked normally again after it restarted.

Thank you for your support