iOS 26 Cellular doesn't work after update

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

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

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 noticed this issue with cellular (sim) loss since beta. I’m surprised it’s unresolved even after official release. So better apple!

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.

None of the Ts provided has worked for me so far. Ive done:

1. Airplane mode
2. Reset the settings
3. Clean slate phone without backup
4. Clean slate with backup
5. Single tray sim so i cant change slots
6. Tray wont fit so I cant flip it
7. Downgraded to ios18 (worked there) but got upgraded back (no longer worked)

Apple support told me it was a hardware issue in the diagnostics TWICE and on the third time finally told me they are aware of the issue.

I downgraded to ios18.7 and the SIM card is recognizable again. The problem is not with the hardware. Only problem with my own downgrade was I lost everything on my WhatsApp because it required a key code to restore my backups which I never remembered creating.

miribenn wrote:

I downgraded to ios18.7 and the SIM card is recognizable again. The problem is not with the hardware. Only problem with my own downgrade was I lost everything on my WhatsApp because it required a key code to restore my backups which I never remembered creating.

If you used an IPSW from the internet you will have many more problems with that jailbreak iOS.

Make sure whether Lockdown mode is enabled or not

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

it works for me witching the Roaming data on and service. thank you

I also have the iPhone 14 Pro Max and after Tuesday’s installation, nothing works was on the phone with Verizon and then Apple for almost 3 hours on Wednesday and still have no issue after doing tons of resets, including the SIM and network settings. Try to follow the suggestion here, but I don’t have any duplicate eSIM‘s to move up and down wondering if anyone else has found a solution since I still cannot make any calls get any text messages view emails or check my calendar.

Rowleysghost wrote:

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

That only works on twin SIM tray phones intended for the Chinese market, all other iphones only have one tray location. Simply removing and replacing the SIM while the phone is turned ON has the same effect