@bluejay You need a phone of some type, cell or landline (cheap cells are cheaper than landlines), to call 911. You also need a working phone number for a lot of things, like letting your work contact you, or if someone needs to come out and do home repairs.
You can move out, but you really can’t get away from your parents until you’re 18, because you’ll still need them to sign legal contracts. You need them for medical insurance/Medicaid. If you get in trouble with the law (like for staying out past curfew), they’ll still be called. If you live in Georgia, Idaho, Kentucky, Nebraska, South Carolina, Texas, Utah, West Virginia, Wyoming, it’s illegal for you to run away (which is what you’d be doing). If you lose your job, you’ll have to have your parents sign all the tax and child labor forms.
Also, don’t underestimate how crazy expensive food is. And then adding in all the regular but infrequent expenses – car oil changes, haircuts, buying new batteries, buying more trashbags, buying more bandaids, etc – really add up. And then there’s the stuff you can’t anticipate needing to buy – the pair of scissors broke and needs to be replace, the car needs work, the broom snapped in half – it just goes on and on. And since you’re a minor, there’s a limit to how much you can work, and therefore earn.
You can, but if things aren’t really, really bad at home, I wouldn’t advise it. You won’t be as free as you think, especially not on the bigger things. It’s really rough, and probably won’t be a better situation.