user: Hi, I want to apply for disability benefits and would like to know what document I need to have in order to complete the application?[NEWLINE]agent: Do you know if you are eligible for disability benefits?[NEWLINE]user: Yes I am eligible.[NEWLINE]agent: You may have to provide documents to show your eligibility, such as a birth certificate or other proof of birth, do you have such a document?[NEWLINE]user: Yes I have a birth certificate.[NEWLINE]agent: You may also need proof that you are a U.S. citizen or that you are a lawful alien, do you have such documentation?[NEWLINE]user: As I was born in the U.S. I don't think I will need to proof that I am a U..S. Citizen.[NEWLINE]agent: Yes in that case you will not need any other documentation.[NEWLINE][BOUNDARY][NEWLINE]user: I am glad to hear. Do you know of other ways to apply for retirement benefits? maybe I should apply in person or can I call?[NEWLINE]agent: Yes, you can apply by phone.  Call 1 - 800 - 772 - 1213 or TTY 1 - 800 - 325 - 0778 from 7 AM to 7 PM Monday through Friday.[NEWLINE][BOUNDARY][NEWLINE]user: Will I have any problems if I already have Medicare benefits?