On iOS, C ++ (apparently) works for internal code, however you will need Objective-C to handle the GUI / event. (Corrected). In addition, Android code is usually Java. Although you can write your own code, it is often slower due to the communication overhead between the native code and the Dalvik code on Android.
Guile builds with GCC, and Apple Xcode contains a GCC variant, so you can make it work. However, I would be careful about a few things:
1) Apple GCC , Guile.
2) Guile LGPL (GNU Lesser General Public License) iOS, Guile GPL, ( , ).
( Mac), Guile Xcode.
Guile , . Guile - , . , , , JavaScript () .