Do you want to trade or do you want to mine ?? if you want to do mining, a tool is needed. but if you only want to trade all you need is funds and an android or laptop ...
Laptop is better for trading as well actually i don't use android for trading. Especially i like to enjoy trading in binance and kucoin exchange. Actually my first trading start in binance after few month later i look like kucoin almost in prl.