I have seen bounty hunter doing well, I have also seen people who do not participate in bounty and are making it well with trading alone, but I have never seen anyone around me being involved in mining, I learnt mining is more risky and cannot just be done alone, and if you even attempt it probably with your android, you may end up wasting your time and not even making it as the traders and hunters. It tend to take a massive effort to be successful in mining, you need good electricity,good mining wallet, computer with good capacity, and some other gadgets. Considering all this, which of all the participation do you see as least demanding and easiest?
Bounty hunting could have been profitable in 2017, when all the hype around ICO thing. Mining through cellphone? as you have said it's just a waste of time. And you are late if you think you can solo mine. Almost everyone here trades, because that's the where the money is. Of course, you can try staking if you wanted to get yourself into alt markets, but there is a huge risk. So I will prefer trading, at least you have total control, it might take some time for others to learn the tricks and trade, but it's gonna worth it specially if you seen money coming in.
There is an easier way to trade without risk, it is to copy the trades of more experienced traders. Almost any site has a function for your account to fully copy the transactions of any account you choose as a percentage. Here you do not need deep knowledge and you fully trust a professional. But if he loses everything, there will be no one to blame.