Check your plans
- To use two different carriers, your iPhone must be unlocked. Otherwise, both plans must be from the same carrier. If a CDMA carrier provides your first SIM, your second SIM won't support CDMA. Contact your carrier for more information.
- Both plans must be set up and ready to use.
- Make sure that you're in an area with supported coverage and that there are no service outages in your area.
iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XS Max, and iPhone XR purchased in China mainland, Hong Kong, and Macao can use two physical SIM cards. If you aren't in China mainland, or if you're in Hong Kong or Macao and have an iPhone XS, get help with Dual SIM with an eSIM.
Make sure to install both nano-SIM cards properly
If you think that neither SIM card—or SIM-card slot—works, follow these steps:
- Remove the SIM tray and inspect the SIM cards for signs of damage or corrosion.
- Remove your SIM cards from the SIM tray, then put the SIM cards back as displayed here.
- Make sure that you close the SIM tray completely, so that it isn’t loose.
- Open Control Center and make sure that both carriers appear in the status bar.
- Go to Settings > Cellular or Settings > Mobile Data and make sure that you see both plans.
- Tap each plan and make sure that the information is accurate.
Contact your carrier for a new nano-SIM in either of these situations:
- If a SIM card doesn't work in either SIM slot.
- If a SIM card doesn't fit or is bent.
If the primary or secondary SIM slot doesn't work with more than one SIM card, remove the SIM card that works and insert only the SIM card that isn't working. If it still doesn't work, contact Apple Support
If you're on a call and see No Service on your other line
Your iPhone can use one cellular data network at a time. When you're using one line to make a call, your other line shows No Service. If your carrier supports Wi-Fi Calling on your other phone number and you have Wi-Fi Calling turned on, you can answer incoming calls on that number. When you're on a call that isn't your default data line, you need to turn on Allow Cellular Data Switching.
Still need help?
If you are still having issues, contact Apple Support.