Board Thread:Questions and Answers/@comment-27996636-20180322090211/@comment-32233739-20180322094943

you only lose stones if transferring to a different OS i believe

so iOS to iOS you wont lose stones

but iOS to Android or vice versa will lose stones

not sure if you would lose stones if going from 1 version of android to another though - as that could mean someone lose stones just from upgrading to a newer version of android

can't confirm that last part though