Force users to enter a phone or cell phone number before sending form the Wappler way

Hi Georg

Sorry, i have been working with wappler for a year but i am new to the forum.
I’m not sure to which address I can send my request to get an answer.

I want to force the user to enter a phone or mobile number. If he fills out both, that’s okay, if he doesn’t fill out either, an error message has to appear.

How can I “submit” this request.

Greetings
Toni