Orcvader, yep, I'm finding it a bit confusing. There's no SD card in my phone at all. I updated to android 4.1.2 months ago. Does that mean I'm not on stock samsung firmware or is that something different? Looking in application manager, there's only 16 apps that have found their way into the 'On SD Card' column, most of which I downloaded plus some default apps like iplayer, google play services, google play store and samsung push services. Going through the 'All' column, those are the only apps that give me the option to move to SD Card, but they're already on there anyway (well, internal memory presumably). For everything else, the 'move to SD Card' is greyed out.
Also, google earth shows only 4.39MB on SD Card. It says:
Storage
Total 44.18MB
Application 20.79MB
USB storage app 0.00B ?
Data 764KB
SD Card 4.39MB ?
Cache 18.24MB
So I can't move the rest of it, and it says nothing under USB storage, yet it says I have an SD card.
Bigboy, thanks for the recommendation, I'll look into this Slimkat then, sounds good!
postmanfw, about the microSD, yeah, that would solve a lot of problems. Which one do you recommend that would also be cheap? Can I assume that the 'Move to SD Card' option will become available for many more apps, given the confusing information above?