Since BiblePay PoDC and PoDC unbanked are gone, are you doing anything else useful with Android smartphones?
I saw Neummanium mentioned Einstein@Home and SETI@Home, but I'm not sure if they are paying Neummanium for those projects any more...?
https://icesword.co.jp/en/computingforgood/
I used to get Neummanium automatically with 0Byte on WCG. Not sure haven't done a lot of boinc crunching lately. But I don't expect Neum to be a big winner.
Really 0byte is the only good coin I've found that rises even in this market. The payout is much better than gridcoin too.
I'm looking at a curecoin/foldingcoin merged setup for desktop. It uses Chrome for a client, and chugs along in the background without much trouble. Kind of Boinc Lite. I believe it has an android client, and is of course a charity coin.
There have been a lot improvements for miners on android. I've been mining Uplexa with phones recently. It has a really nice client that can adjust number of cores and CPU time, and gets decent hash rate. Near gone are the days of overheating phones. I suspect there are other CPU coins that work decently on android. It's just finding them.