I just had a quick look at Zero and BitcoinZ GitHub repos for thier mobile-wallets and they are forks of the myzenwallet which is a web wallet and doesn’t support private addresses. Who knows they could be doing something else like ZecWallet by connecting to a remote node on your PC.
I won’t go into a deep dive comparison of the difference between every privacy coins wallets here because, we have gone off topic enough already. Feel free to make another thread.
And as a side note you should remove or change the title of your other thread since you really haven’t left at all. Why did you leave Zcash or sold all your ZEC?