Who called from 4436614008

I have got two phone calls from this phone number and left no message so I have no idea what is this all abou it.

Caller ID says 'Christopher Vernon'. Seems to be from Elkridge MD. Has called repeatedly, both on weekends and weekdays, but does not leave a message

He calls at least a couple of times a month. It's a local number for me, caller ID says "Vernon, Christopher." I'm not positive but I think it's someone calling from a charity.

We give to Leukemia/Lymphoma Foundation & it could be them or Purple Heart.  We gave to them ONCE over 10 years ago & still get calls from them.

Called 12/21/14 -on two home phones.Says Christopher Vernon. Did not pick up, as did not recognize name. He left no message