I’ve been doing that lately with a couple of apps and getting some neat results. I have my spidey (for those of you who have read my previous posts) to hold my phone while i take pics, otherwise there’s always a slight blur.
So HDR is a way to add more "dynamic range" to your photos. Dynamic range = ratio of light to dark in a photo, so the phone camera takes 3 exposures for you and the phone does all the work putting them together. Results are closer to what you actually see than what the camera is seeing.
I use this app Camera FV-5https://play.google.com/store/apps/details?id=com.flavionet.android.camera.pro
Lets you control lots of things only available on DSLRs.
For HDR photos use Snap Camera (https://play.google.com/store/apps/details?id=com.marginz.snap)