How to Fix iPhone 16 Cellular Data Not Working After iOS 26.1 Update

iPhone 16 Cellular Data Not Working After iOS 26.1 Update usually means carrier settings need to refresh, the phone is stuck on a bad network session, or the update changed cellular and eSIM behavior.

For related help, also see the iPhone 16 hub, How to Fix iPhone 16 Bluetooth Dropping Connection to Accessories, How to Fix iPhone 16 CarPlay Not Connecting or Keeps Disconnecting, and How to Fix iPhone 16 SMS Messages Getting Lost After iOS 26.1.

Fix #1: Toggle Airplane Mode and restart the iPhone

This forces the cellular modem to reconnect cleanly.

1. Turn Airplane Mode on for 30 seconds.
2. Turn it off again.
3. Restart the iPhone 16.

Fix #2: Confirm cellular data is enabled

The update may have changed which line or service is active.

1. Open Settings > Cellular.
2. Make sure Cellular Data is turned on.
3. Confirm the correct line is selected if you use dual SIM or eSIM.

Fix #3: Check for carrier settings update

Carrier updates often fix mobile data bugs after major iOS releases.

1. Open Settings > General > About.
2. Wait up to 30 seconds.
3. Install any carrier settings prompt that appears.

Fix #4: Reset network settings

This can repair broken APN, eSIM, and modem configuration without deleting your files.

1. Go to Settings > General > Transfer or Reset iPhone > Reset.
2. Tap Reset Network Settings.
3. Reconnect to Wi-Fi and test cellular data again.

Fix #5: Disable VPN and data restrictions temporarily

VPN profiles and screen time restrictions can block mobile data for some apps.

1. Turn off any VPN app.
2. Check Screen Time or mobile data limits if used.
3. Test Safari over cellular again.

Fix #6: Remove and re-add the eSIM if your carrier recommends it

If the update broke the line profile, a fresh activation may be needed.

1. Contact your carrier first.
2. Delete the affected eSIM only if they confirm it is safe.
3. Activate the line again using the carrier app or QR code.

Fix #7: Install a newer iOS version or contact the carrier

Apple or your carrier may already have a fix available.

1. Open Settings > General > Software Update.
2. Install any version newer than iOS 26.1.
3. If data still fails, ask the carrier to reprovision your line.

If cellular data is still down, browse the iPhone 16 page for more troubleshooting guides.