supporting processor is one thing and supporting OS is another.
PyPy runs fine for example on x86_64, but does not support windows 64 natively (although windows 32bit version works fine on windows 64).
There was some work done to run it on Android, however it did not get very far and I'm not sure what's the status. For iOS there are quite a few problems, most notably iOS does not allow JITs (other than apple's own) to run on this platform - which means PyPy is mostly useless.