IPhone 4s will not receive or send texts and calls?

I have been to every apple support page and tried everything it said to do. Nothing has worked so far. It also says my phone number is unknown to my iPhone and any SIM card options are light grey and unaccessible. I have reset my phone three times already. It has no problems connecting to Wi-Fi or sending/receiving iMessages, FaceTime calls, emails, or anything done over Wi-Fi, but if somebody without an apple device tries contacting me, it won't go through. Any suggestions?

1. Could be that your phone is not reading your SIM card:
- Check that the SIM card is inserted correctly
- Check the SIM in a different phone and see if it works in that phone

2. Your SIM may not be active:
- Check with your carrier and make sure your account is active

3. Your phone may be SIM locked to a different carrier

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