Linda 💬 2020-12-24...
To troubleshoot iPhone activation error, you might as well check out this guide: https://www.joyoshare.com/iphone-repair/iphone-activation-error.html
Abigail Terry 💬 2018-02-17...
Make sure that you inserted the sim card in correct position.
Toggle to GSM 2G network may resolved this issue might be your phone is set up to LTE that your area doesn't support.
if all fails
you can follow Solution No. 1 provided with this website works for me
https://www.errorsolutions.tech/error/iphone-error-no-sim-card/
very informative and has a picture on it easy.
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