Unable to make calls from Contacts without a +1 before each number saved in my Contacts

[AC Question]

Hi there,

I recently switched from a Blackberry to the S6 and ported my Contacts over. I am unable to make calls from my contacts unless the number is saved in my contacts with a +1 in front of it. Am I going to have to add a +1 to the number in every single one of my contacts (I have thousands of Contacts!) or does someone know a quit tip to resolve this issue?

Thanks in advance!