Set default phone number for a contact

Hello Lala70,

Welcome to Apple Support Communities! You've got a great question, and I'd like to help, so you can set a different number for a contact's default phone number.

The steps to change the default contact method vary a bit between iOS 12 and iOS 13.

For iOS 12: To change the default contact method (for a call, for example), touch and hold the call button, then tap a phone number.

For iOS 13: To change the default phone number or email address for a contact method, touch and hold the button for that method below the contact’s name, then tap a selection in the list.

This information is found in the iPhone User Guide.

Cheers!