There could be several reasons why your SIM card is not working on your phone. Here are a few things you can try:
Check if your phone is unlocked: If your phone is locked to a specific carrier, it may not work with a SIM card from a different carrier. Contact your carrier to unlock your phone.
Check if the SIM card is properly inserted: Make sure the SIM card is properly inserted into your phone. Try removing it and reinserting it to ensure it is in the correct position.
Check if the SIM card is damaged: Examine the SIM card for any visible damage or signs of wear and tear. If it appears to be damaged, you may need to replace it with a new SIM card.
Check if the SIM card is expired: Some SIM cards have an expiration date. If your SIM card has expired, contact your carrier to obtain a new SIM card.
Check if there is a network issue: Sometimes, the issue may be with the network and not your phone or SIM card. Contact your carrier to check if there are any network issues in your area.
Check if your account is active: If you have not used your phone or SIM card in a while, your account may have been deactivated. Contact your carrier to check if your account is still active.
If none of these steps work, contact your carrier for further assistance