Who called from 9017515105

Got a call at approx. 5:30 p.m. Picked up phone on fourth ring and was hung up on as soon as I said, "hello". Saw phone number on caller id and called back to hear, "leave a message" and then "You can't leave a message as this person's mailbox is full".

Called just now (5:08 Mtn time).  Phone rang twice.  When I answered the caller hung up.  Googled Area Code 901 and found that it's in Tennessee.

Called about 10 mins ago for the 3rd time, each time i answered there wasn't a response from the caller so i hung up. How freaking annoying!!!!

Dead when I answered.  Busy when I called back.  Memphis area code

Saturday 4 PM, I answered on 3rd ring and they hung up. Cost me 75 cents to do a call trace and it gave this number: (901) 751-5105. The area code is from Tennessee. Why does anybody do stuff like this ?