Here's a really simple way to HIDE your bitcoin/blockfolio in public by using Blackberry Privacy Shade app for Android, you DO NOT NEED a Blackberry to use this cool feature. Next time you are in the elevator, traveling in airplane, etc... this should help you check your bitcoins/altcoins without revealing your whole portfolio.
Grab the app here:
https://play.google.com/store/apps/details?id=com.blackberry.privacyfilter&hl=en_US
Also check out my Blackberry Key2 review if you are interested in the device:
But I personally recommend the Note 8 or upcoming Note 9 as the S-Pen is super-useful for crypto.