time travel is observed now in particle physics
anti particles trace the path the real particle would trace except the anti particle behaves exactly as it would if it moved backward in time
most normally observed with electrons and it's anti particle the 'positron'
here is a photo to prove it
So, it may from our present level of technology and place in the universe now to send messages backward but not forward in time.....
Also remember Einsteins special theory of relativity....
A good video to understand how large distances in the cosmos can distort one reference frame to what is the present past or future is here ....
skip to 21 minutes in exactly ... and watch
https://www.youtube.com/watch?v=4BjGWLJNPcAif this is not enough to convince you here is evidence of time travel no one will dispute....
in this video from 1928 a Charlie Chaplin movie a woman is clearly seen talking on her cell phone
so therehttps://www.youtube.com/watch?v=HhA6cxtncgY 
