Why your iPhone or Android phone says no SIM although you have a SIM card?
If you get the error of no SIM card detected, how to get rid of this situation?
Reasons and some methods can be found in this post.
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Just follow the fixes mentioned byMiniToolto easily troubleshoot your issue.
A question comes from you: why does my phone say no SIM?
But dont worry and you might get rid of this trouble if you try the troubleshooting tips below.

Lets go to see them.
If not, continue the fix.
Just remove the SIM, wait for half a minute and then reset it.
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Restart the PC and see if it can detect the SIM card.
This can help to disconnect from all connection services and may solve the no SIM issue.
On iPhone, go toSettings > General > Transfer or Reset iPhone > Resetand tapReset web connection tweaks.
To fix this issue, change the connection mode to auto.
XXX is different based on your situation.
Just navigate toSettings > Mobile networks > data pipe operators > Search networks.
After searching, you’ve got the option to see a list of web link carriers.
Go to choose the correct internet operator.
Now follow these three ways in this post to easily erase or wipe your iPhone without passcode.