You need to change the country dial-in code for phone participants so that they get a Swedish telephone number to join a meeting. You do this under Meeting Settings, and the Telephone tab at the upper right of the page. Under Global Dial-in Countries/Regions, it says United States with a pen icon next to it. Click on the pen, remove United States from the right column and choose Sweden in the left column. Click on Save. The telephone number will be visible in the meeting invitations you send out.
It is also nice if you upload a picture of yourself, which will be visible in the meeting room when your camera is off. When you log into Zoom, click on the grey man in the upper right corner to get to your profile. The top alternative is to upload a picture.
In the same section, you also add which university you work at.