The phone numbers for the jail are 404.865.8001 and 404.865.8010.
Typically the jail will accept cash in the full bond amount, or you can go through a bail bondsman — who will likely charge a nonrefundable fee for posting the full bond amount on your behalf.
If you intend to post the full amount yourself, keep in mind that a personal check will not likely be accepted and you should have a picture ID with you. Also, you may not be able to bring your cell phone into the waiting room area/lobby of the jail. Budget plenty of time as it could take quite a few hours for the process to be completed.