For an interesting religious turn of events on this subject concerning communication with the departed, you may wish to visit the following:

After-Death Communication - Prayer Wave

I have been hearing a lot about calls from the departed.
They say it has something to do with the electromagnetic field.

If they call collect don't accept the charges, far to long distance.

Things like this, I am very wary of. That could be the real spirit of the departed and THEN again, it could be a dark spirit, in the mask of the departed loved one.