iOS 18.6 Update Issues in 2025 — What’s Going Wrong and How to Fix It

Apple’s iOS 18.6 brings essential security patches but hasn’t been without its headaches. Here's a breakdown of the most commonly reported problems and how to tackle them.

1. eSIM “No Service” Bug

Many users report losing cellular service after installing iOS 18.6. Even after rebooting, resetting network settings, and contacting carriers, the issue persists—pointing to a software bug. 

Fixes to try:

• Reset network settings

• Reinsert or replace SIM/eSIM

• Update carrier settings

• As a last resort, restore via iTunes and set up as a new device 

2. Battery Drain & Overheating

Some iPhone 14 Pro Max users noticed excessive battery drain and overheating. While one user found relief using low-power mode, another reported the issue began suddenly even during light use. 

Try This:

• Monitor background apps (like Facebook)

• Update all apps

• Use Low Power Mode temporarily

3. Mail App Freezes & Lag

There are occasional reports of the Mail app freezing when pulling down to refresh. It seems to affect only some devices in the 18.6 release candidate. 

Workaround:

• Restart your iPhone

• Use pull-to-refresh sparingly, or access Mail via its icon instead

4. Sound Controls Consolidated

Under iOS 18.6, all app volume settings are now found under “Sounds & Haptics”—a shift that has disrupted alarm customization for some users. 

5. Performance Issues & UI Lag

Some users, especially early on community forums, noted sluggish performance, slow animations at startup, and general lag—particularly on older devices or right after installation. 

Quick Summary Table

Bottom Line — Still Worth Updating?

Yes. Despite these frustrations, iOS 18.6 is vital to install. It includes over two dozen critical security patches, including fixes for WebKit vulnerabilities, VoiceOver passcode exposures, and address-bar spoofing. 

Expert Tips for a Smooth Update

1. Back up your phone before updating.

2. Update apps and iOS to the very latest after installing 18.6.

3. Monitor battery usage and reboot if you notice overheating.

4. If Mail or eSIM issues persist—reset network settings or contact Apple Support.

5. Stay on the lookout for minor follow-up patches to address these bugs.

Consistently installing updates like iOS 18.6 remains the safest path forward—security always comes first. Let me know if you want ready-to-add HTML, internal link integration, or a troubleshooting guide for one of these problems!

Also read:  Apple iOS 18.6 Update: Fixes Critical Security Flaws, And Powerful New Features