Hi ​@Renske 

The Salesloft Dialer defaults to calling the Home Phone field in your CRM and while there is no built-in way to change this behavior, there is a workaround that would require you mapping the Mobile Phone field to the Home Phone field in Salesloft. 

Alternatively, if there are multiple phone numbers for a Person, you can manually select the number you wish to call using the dropdown menu in Dialer, before initiating the call. 

Regardless of the option you choose, I would encourage you to submit Product Feedback using the Submit Feedback link located in your Profile menu dropdown. 

Thx Rob,  I noticed that when you run a call in a cadence you can select to other option, when you call form quick task then it immediatly starts to call the office phone. I will submit the feedback