If your iPhone suddenly loses signal, can’t connect to Wi-Fi, or shows “No Service” after updating to iOS 18, your carrier settings may be corrupted. Resetting your network configuration can fix connectivity issues with AT&T, Verizon, T-Mobile, and other US carriers — without erasing your personal data.
Here’s how to safely reset network settings on iOS 18 and restore stable connections.
Before you begin, understand what this reset affects:
Deletes saved Wi-Fi networks and passwords
Removes paired Bluetooth devices
Resets VPN and APN configurations
Keeps your photos, apps, and files safe
📍After the reset, you’ll need to reconnect to Wi-Fi and Bluetooth devices manually.
Go to Settings → General → Transfer or Reset iPhone.
Tap Reset → Reset Network Settings.
Enter your device passcode if prompted.
Tap Reset Network Settings again to confirm.
Your iPhone will restart automatically — this rebuilds all network stacks and clears outdated carrier data.
After rebooting:
Open Settings → Wi-Fi and select your network.
Re-enter your password.
Turn on Bluetooth and pair accessories again (AirPods, CarPlay, speakers, etc.).
If Wi-Fi or Bluetooth still doesn’t connect, move to the next step.
Outdated carrier configurations can cause call or data issues.
Go to Settings → General → About.
Wait 10–15 seconds — if an update prompt appears, tap Update.
Restart your iPhone afterward.
For manual verification:
AT&T → Carrier version should show AT&T XX.X
Verizon → Verizon XX.X
T-Mobile → T-Mobile XX.X
If you don’t see an update, your settings are already current.
If cellular service is still unstable:
Go to Settings → Cellular → SIMs.
Tap your carrier → choose Remove eSIM.
Restart iPhone → Go to Settings → Cellular → Add eSIM.
Scan the QR code provided by your carrier or use Transfer From Nearby iPhone.
This step resolves most eSIM-related dropouts.
If signal problems persist after the reset:
AT&T: Call 611 or visit att.com/device-support
Verizon: Call *611 or use verizon.com/support
T-Mobile: Use t-mobile.com/support
They can refresh your network registration or push a new SIM profile to your account.
Whenever you notice poor reception after a major iOS update, try a network reset before factory resetting your phone. It’s quick, safe, and often resolves signal drops or Wi-Fi disconnects — especially on 5G networks in the US.
For stable connectivity, keep Carrier Settings and iOS updates synced under Settings → General → About.
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