Maybe another "You" from parallel universe made a call to you. Since it's "You" who was calling "you", but in different dimension... it's still "you" calling "you". So you saw "your" number on your cellphone, although the call was made from another dimension, by "you". Then the supercomputer that manages the parallel universes and dimensions realized a leak in two dimensions (caused by "you" calling "yourself") and cut the call before "you" from other dimension could speak to "you" in this dimension... thus preventing the possible confusion and probably some damage to time-space continuum across parallel universes.
So be glad a major catastrophe was avoided. :bleh: