If possible, you should contact Social Security before you are released. As soon as you know your scheduled release date, ask someone in authority if they have a prerelease agreement with Social Security. If so, they may be able to contact Social Security for you. If they don’t have a prerelease agreement, you want to contact Social Security yourself at 1-800-772-1213 and give them your social security number and your expected release date. They can give you further instructions and make an appointment for you at the local Social Security office if necessary. After you are released, you will need to furnish Social Security with proof of your release and the date of release. Depending on the circumstances, Social Security may be able to have your checks started effective with the month after the month of your release.