Actually now you mention it, I only ever saw the thumb keyboard working on the unit where I took the film off - it worked really really nicely with the improved-sensitivity N810 touchscreen (much improved compared with the 770 - not sure about compared with N800), can't seem to get it to work with this one no matter how much I exaggerate the big contact area - maybe I'll take the film off/maybe not, given how scratched the film looks already...