You may contact Social Security at their toll-free number: 1-800-772-1213. The “filing date” for your claim will be the day you call, and will later be used by Social Security to calculate when your benefits will start – so the sooner you call to file your claim, the better.
When you call, Social Security will get some information from you: your name, address, birthdate, Social Security number, the last day that you worked, and other basic information. They will also arrange a telephone interview with you, which means that a Social Security representative will call you on the phone at a date and time they set to get more specific information for your application. Do not forget to be near your telephone, waiting for the call, at the date and time of your interview.
You may also access an online application at www.ssa.gov.