if you want to know why does my iPhone say no sim and prevent its future occurence then follow:
– Avoid bending, scratching, or exposing it to dust and moisture.
– Always insert the SIM card securely in the tray.
– Keep your software up to date
– Use only Apple-authorized services to prevent any hardware issues.
– Ensure the SIM is supported by your carrier and iPhone model.
– Use a durable case to prevent physical damage to the SIM tray or internal components.