I want a phone that is just a computer. I don't want a phone that tells me where I am allowed to install software from, or where I am allowed to get it from. I

I want a phone that is just a computer. I don't want a phone that tells me where I am allowed to install software from, or where I am allowed to get it from. I just want a computer that is small and has a phone in it. I don't care if it is linux, I don't care if it is open source!