If you see or in the status bar or a message that the SIM is not recognized:

1. Turn your phone off and then on again.

   Press & hold the Power button, then touch Power off. Then turn it on to establish a new connection with the network.

2. Do one of the following:

   • If your phone allows one SIM card, turn your phone off, then remove and reinsert the SIM.

   • If your phone allows dual SIMs, disable the SIM, then enable it again. Go to Settings > Network & internet > SIM cards. Turn the SIM off . Then turn it on .

     If one of the two SIMs is working, remove the SIM that is not recognized and try it in the other SIM slot. If it doesn't work in the other SIM slot, then the issue is with the SIM card and you need a replacement from your carrier.

3. Contact your carrier to make sure your account is set up properly.
4. Ask your carrier to replace the SIM card.
5. Perform an external phone reset.

1. If you usually have a signal but the status bar shows in your current location, move to another area where you can receive a signal, like outdoors. If you’re uncertain whether your carrier provides service in that location, check the coverage map on your carrier’s website.
2. If airplane mode is on, turn it off.
3. Turn your phone off and then on again.
4. Check for app updates.
5. Check if a software update is available for your phone.
6. Check that the Preferred network type is set to Global. (Settings > Network & internet > Mobile network > Advanced > Preferred network type.) If you’re experiencing service issues when it is set on Global, try a different setting. Not all carriers support this feature.
7. Remove your SIM card and reinsert.
8. Use safe mode to see if apps you installed are causing the issue and uninstall as needed.
9. Reset the phone.

1. Turn your phone off and then on again.

   Press & hold the Power button, then touch Power off. Then turn it on to establish a new connection with the network.

2. Clear the cache for the Phone app.
3. Use safe mode to see if apps you installed are causing the issue and uninstall as needed.
4. Check if a software update is available for your phone.
5. Reset the phone.

Outbound calls

1. If you hear a fast busy signal when you call a number, all cellular circuits may be in use, preventing the call from going through. Try calling again later.
2. If you hear a fast busy signal every time you call the same number, your number may be blocked by an app. Try calling from a different number.

Incoming calls

If you have a signal and can make calls, but callers tell you they consistently get a busy signal when calling you, check that you haven’t blocked their numbers.