Recent research shows that people who die make their presence known in a number of ways:

(1) Sensing their presence
(2) Hearing their voice - clairaudiently and through Electronic Voice Phenomena
(3) Feeling their touch
(4) 'Smelling' - having same smell when on earth
(5) Seeing them as if they were real
(6) Seeing a flat vision of them like a photo
(7) Experiencing one of these while half-asleep
(8) Having a visit in a dream - but the dream is unusually vivid and you do not forget it like a normal dream
(9) Having an out-of-body experience and meeting them
(10) Receiving a telephone call from the person who died (ITC - two-way conversations have actually been reported)
(11) Experiencing electrical appliances such as lights, TVs, and radios going on and off
(12) Seeing crossed over afterlife residents on a television screen by way of Instrumental Trans-communication (ITC)
13) Actually meeting afterlife residents when they materialize and being reunited with loved ones.