I tried fiddling with the latex plugin on my computer, but still can't get the latex to show up on my phone - I see either boxes or boxes with question marks in. Any idea how to fix this?
Check your phone with a file manager application. Is there a directory AnkiDroid/general.media/ on the sd-card of the phone with the same set of png-files generated from the latex as there is on the PC?
Spaced repetition is one of the most efficient ways to learn new things. (For research citations, see 'Study methods', here.)
The best way to practice spaced repetition is to install Anki to your phone, since you have your phone with you all day long.
I have an Android phone, so here's my 60-second guide to getting started with Anki on Android: