Yeah, it's cool making money online with the help of your smartphone, a lot of people nowadays just use their smartphone for calls chats and all those things, not name that they can use their phone to make some cool money daily, in what way? With the help of your phone you can make money online in a PTP site like trendri and beer money forum, those are my best and legit site,you earn daily by posting quality post and threads
You can also make money online with your phone by playing online games, crypto pop game is a game you can earn ethereum while playing it, it's legit and it's withdrawable,you withdraw into your coinbase wallet
You can also use your phone to make money online through affiliate marketing, which is advertising someone's else business or product then you get your commission in return, when the buyer purchased a product using your affiliate link
As a business owner you can make money online using your phone to advertise or promote your business or product using social media, we have so many social media, you can choose yours, for me I prefer Facebook and TIK TOK, because you'll meet millions of people.