Help facebook contacts--why do you vex me?

[kidon]

When I sync'd my facebook with my contacts, all of the contacts that sync'd, there phone numbers all have a +1 prior to the area code (ie +1888-555-5555). When I attempt to call one of these contacts, the call fails and I have to manuly adjust the number prior to calling again.

Is there a setting or something I missed in facebook or on my phone?

Thanks.