What I would suggest is starting a team with your YouTube channel. Team up with someone who has a laptop or a camera or anything of the like. Edit videos with them at their house. I hate to be blunt, but it's going to be next to impossible to grow on YouTube with only a cellphone. It's hard for me to grow with this old laptop I use. With a cellphone, you don't have control over anything. You might be able to find some really cheap apps to edit audio, but you'll have to go through so many tedious things to compete with people on a computer. You gotta find a way to make some money, man. With a phone, if you plan on getting revenue, you could try making Vines or posting Twitter videos. If you don't plan on monetizing and don't have a team.. Best bet is to get a job and save up for everything you need.