Export contacts number from iphone to sim card

It is not possible to export contacts to a SIM card on an iPhone. See the following from Import contacts from your SIM card to your iPhone - Apple Support

iPhone doesn't store contacts on the SIM card. If you want to transfer contacts between iPhones, you can use iCloud to backup or transfer contentbetween devices.

That is because the iPhone does not store any data on a SIM card.

don't think any modern phone support storing contacts on the sim card anymore