can damage the smartphone components we have
Nah, it won't damage your phone. The app is not doing any work. It's a simple airdrop, with no rules set. Today you can "mine" 5 ETN, tomorrow it could be 2 ETN, depending on Richard's mood.
CharlieCox got rid of the app to use a paper wallet (I assume) as its safer and is a good idea, though without the app you cant use the Instant Payments so it has no unique or interesting features at that point.
+1