Who called from 2516537382

no details, whoever it is hangs up when I answer.  Have had a number of
calls from this number

Caller purported to be a survey but asked too many personal questions in the pre-survey "qualifier" phase...Comes up to BellSouth phone service Mobile area, Alabama and individual's accent perfectly matches that area...implied it might have to do with HMO/doctors/news agencies/military.