How does iphone delete the information and phone number stored in SIM card?

You can't directly manage the phone numbers and messages on the SIM card in the iphone. You can only import the address book on the SIM card into the phone address book. If there are unnecessary information and phone numbers on the SIM card, you can take the card out, restore it to a large card, put it in an ordinary mobile phone, and delete the short message.

If you want to delete the contact numbers and messages on your mobile phone, you can use the "synchronization assistant" to manage them, which will be more convenient, especially when there are many contacts and messages. If you just want to delete contacts and don't have a computer, you can install QQ Synchronization Assistant. In the "More" menu, you can manage contacts and clear the phone address book.

I hope this helps.