I know you can download a HUD for the PC programmes of poker sites however I only use the mobile/tablet Apps. Is there anyway I can apply these programs through my phone?
No you can't. Mobile oeprating systems (android and ios) are working in such way that they do not allow one program to mess with another so it is not possible to display the hud over the mobile poker client. There is one more serious limitation - mobile clients do not save hand history so even if there was a way to display a hud it could not load needed information to display it due to the missing hand history. IF you want to use hud you should play on PC or laptop.
If you are serious enough about online poker to consider using a HUD, it is much better to play on a PC or laptop anyway. The screen is larger, which allow you to have more tables open. A laptop is perfectly fine for 4 tables, which coincidentally is the new cap on pokerstars for regular cash tables. If you want to play tournaments or SnGs and go above 4 tables, consider a stationary PC preferable with two screen setup.