Can I make calls via my own number?

Hey Jakob! If you're referring to your own personal number, unfortunately no. You’ll need to use either a Lindy-provided number or a number from an integrated service like Twilio.

ooo so if we use aircall could it work? because aircall uses twilio(?) Alon J.

We don't have any actions/triggers for Aircall that actually make a call, but if you have a Twilio account, you can set up a 'Make Phone Call' action in Twilio.