Take out the SIM card
After removing the SIM card, put it back in. You might need to contact your carrier:
- If the SIM card is damaged, or doesn't fit in the SIM tray, ask your carrier for a new SIM card.
- If you transferred your SIM card from another device, ask your carrier if your SIM card works with your iPhone or iPad.
Learn more about removing your SIM card.
Reset your Network Settings.
Go to Settings > General > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
Contact your carrier
Issues with your carrier or account might affect your service. Contact your carrier to:
- Verify that your account is active and in good standing.
- Make sure there are no outages in your area.
- Check that your device isn't blocked from receiving cellular services and is set up with the right data plan.
Only your wireless carrier can access and manage details about your account. If you need help finding your wireless carrier's service page, use the Apple carrier-support article or an online search engine.