Waking up Desktop PCs from Samsung phone

[soulman1949]

I have set up Team Viewer on a number of desktop PCs and on my Samsung S4 mini mobile. I can wake up any desktop computer from any other PC at home but I find I can only wake up my desktop PCs from my Samsung when I am on my home wi-fi. When I switch away from my wi-fi to using my mobile data I cannot wake up the desktop PCs. I'm not sure what I'm doing wrong.

Thanks

Alan