are you sure about this?
i didn't know about this feature prior to your post, so i searched and read this
https://bitcoin.org/en/release/v0.11.0#block-file-pruning reading this part
Block pruning is currently incompatible with running a wallet due to the fact that block data is used for rescanning the wallet and importing keys or addresses (which require a rescan.)
However, running the wallet with block pruning will be supported in the near future, subject to those limitations.
i wonder , does this mean that it can not be used by people who want to use core as a wallet?
Whoops! Looks like you're right and those who want to run core as a wallet won't be able to do pruning mode for now. In any case, I guess it's already clear that core isn't the most convenient (it might be the mose useful, though).
with any smartphone it's better to recommend the bitcoin client, which is something akin to core, for androind, it offer the best protectio for mobile
I think Amph is talking about Andreas Schildbach's Bitcoin Walet for Android.