Are all 800 numbers free

Yes, 1-800 numbers are free for the caller calling the 800 number, although calls from a mobile phone (cell phone) will still incur airtime charges. The owner of the 800 number pays for the service. FYI, the owner of the 800 number receives a list that identifies the caller's number regardless of any features you add to your phone to "block" your number.

The toll-free codes in North America are 800, 888, 877, 866, 855, and 844, with 833 and 822 reserved for future toll-free use.