That's a big IF. There's ProRaw but for that you need an iPhone Pro, some Androids have RAW too but it's huge and lacks even the most basic processing resulting in photos that look like one of the non-final steps in the post.

Third party apps are hit or miss, you pay for one only to figure out it doesn't actually get the raw output on your model and so on.

There's very little excuse for phone manufacturers to not put a toggle to disable excessive post-processing. Even iOS had an HDR toggle but they've removed it since.