** I have a new wd passport wireless pro, i can connect it to my home internet. is it possible that if I am outside with my 4g can get into the my cloud app? or do I have to be connected to the wifi that the passport is also connected to?**
Unfortunately, no.
The MyCloud app works fine for the NAS units; but unfortunately the MyPassport does not support connection from outside the wifi network.
I think you are meant to bring the MyPassport with you 
The hardware really is not intended to be used as a 24/7/365 NAS.
