Sim card is not connected why

See -> If you can't activate your iPhone

If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support

See also -> Manually update your carrier settings on your iPhone or iPad

Manually update your carrier settings on your iPhone or iPad - Apple Support

Contact your carrier.

Maldia Said:

"Sim card is not connected why: I cant put my sim card? I dont know why"

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Troubleshooting SIM Card Placement:

Are you saying that you cannot insert it? If so, request a new SIM card from your carrier, as they are the one who configure it. It may be damaged.