If you want a real mining then I think the better way is to use a real mining device like laptop and pc cause using android for that doesnt really works.
If you're looking to mine Bitcoin or one of the top 100 cryptocurrencies, dozens of computers combined will be of no use. Even new cryptocurrencies with mining algorithms cannot be mined using the power of a personal computer (there are computers with enormous power), let alone the power of a mobile phone.
The only way to mine is to invest in mining equipment and create a mining farm based on the number of devices used.
The problem with cloud mining is that users don't fully understand the concept of real mining and believe everything scammers promote. This is why cloud mining scams still succeed in trapping victims.