My phone uses android 4.0, and I like to use android on the SD card only.
Reason is My updates can't use the limited space.
Is there any stable custom android out there?
There is a thing, for rooted phones of course, to swap the internal storage with an sd card. You would have to google search for it, but if you do that the phone will be very slow since sd cards are way slower than the internal storage.
What do you mean the updates can't use the limited space? What updates phone or app updates?