I think the Android version is by Volker Braun and was more a proof-of-concept 
that he hoped somebody would run with.
Ivan Andrus (iirc) spent a long time on an iOS version, which must be what 
Stefan refers to.
You might find a "Sage Linear Algebra" application for Android which Sang-Gu Lee 
and his students wrote - it use a back-end in Korea.  There is also a keyboard 
you can install, which is much more convenient for certain frequent Sage 
constructs.  This app should allow use any Sage command.
There is a web-page-form (also from Korea, iirc) version, formatted for very 
small screens, where you type a single line of Sage code (use semi-colons for 
multiple commands) and you get back the results as text.
Ideally, as the Sage cell server matures, there will be better front-ends on 
mobile devices.  Maybe the first two listed work this way and the Android one is 
pointing to a non-existent server? (The names were in flux a while ago.)
Reply if you have trouble finding any of these and I can dig further.
Rob
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