Toll-free numbers start with a very specific scheme that consist of a three-digit code that begins with the number 8 followed by two identical numbers. For example: 800, 833, 844, 855, 866, 877, and 888 are toll-free numbers. 

DID numbers begin with a three-digit area code that designates a specific geographic region and can consist of any number combination. 

When porting numbers into Genesys Cloud Voice, there are separate procedures for porting toll-free and DID numbers. To avoid problems, make sure you use the proper procedure for your type of phone numbers.