Q: my iphone not allow me to use it because it ask me to insert aSim Card

You need a sims card to set up your phone and continue to make calls. If you just want to use Wi-Fi you can take the sims out but you will need it initially. Contact your carrier for details.

Remove or switch the SIM card in your iPhone or iPad - Apple Support

Initially you will need a sims card. It does not have to be active. Once you get the phone to work on Wi-Fi you can remove the sims or leave it in if you wish.