Some pervert, who calls and just breaths over the phone.  I think it might be related to child pornography.

Caller ID V01812203006269
Phone rang 2 times, I didn't answer, didn't leave a message.  Call came from 240-252-7125

Received call from this number. The guy started in with some story about disabled veterans needing money. As a disabled vet myself, I told him that even though the VA is slow, there is plenty of help for us vets. Once I stated this to him, he agreed and hung up the phone. Don't give them a penny!

Got a call at 9:29am and didn't answer. Assumed it was a scam.

Nobody on the other end.