Primary Dial-In Numbers will be displayed at the top of all invitations for scheduled calls. The first Primary Dial-In will be the one displayed in the blue bar at the top of every page in your account, along with the access code.
You can change the Primary Dial-in for your account by logging in and selecting the Menu tab at the top right hand side of the screen, then click the Settings tab, then choosing Primary Dial-In Numbers in the left-side menu.
This will display a field where you can enter the country or city of your choice. Click on your preferred location and it will be added to the list. You can add as many Primary Dial-In Numbers as you like. Then click on Save when you're done to lock in your selection.
If you would like to have the option to choose a local US 'urban' number, you might want to consider our City Plan.