Same thing here.  Gotten 2-3 calls a day over the past few days and caller ID says SSI.  I let the machine get it and of course, no message is left.  They've also used: 301-842-8632 and 301-842-8798.

Tonight I received two calls from that number. The first time I answered because 842 is where I live local. There was only a single beep & I hung up. The second time was about 2 & 1/2 hours later I let the answering machine get it and they just hung up.

Same spam called me, exact same thing.

Have received several over the past few days including 2 today.
No message, no ID.

Received a call this evening at 8:38pm from this number.  Phone ID said SSI which I didn't recognize, but I have some things going on and don't know who might call in the few days.  So, I answered and heard a beep, similar to a fax.  Only heard the beep once and the line went dead.  Another annoying telemarketer call?

Stop to call

Likely a solicitor

Who is it?

I received a call from this # on Feb 25 2014. They asked to please speak with my wife, and I responded she wasn't at home. The woman then asked when the best time to contact her would be, and I said it depends who this is. She said have a good night and hung up. They also called yesterday and I had a similar experience. Likely a solicitor because they refuse to identify themselves as to why calling.

I received a call from 301-842-8633 on 24 February 2014. I did not answer. The caller ID stated it was from SSI.  I do not believe the Social Security Admin would use the telephone to conduct business. I also checked the internet and 800notes.com, but could not find any info. Please share if you have any info on this number. Thanks!