Many people wonder how to sign up for Social Security. The quickest and easiest way to apply for Social Security is online through SSA.gov. However, that is not the only way to apply. You can also apply for benefits over the phone or in person at your local Social Security office. Some people choose to start their application online and then visit their local office to provide their documents. Since you are required to submit original documents, many people choose not to send those through the mail. Although the Social Security Administration will return your documents, there is always a chance that they could be lost in the mail.