I used On1 Effects, a plug-in for Photoshop. The X-Trans is also called "ISO-less" because you can do exposure recovery such as this with little to no noise ("graininess") and artifacting. This was shot at ISO 200 in deep shade. I did no noise reduction on this and increased the exposure by around 3 stops. A remarkably usable shot, even so.
As long as you have enough light, and there is not motion that is unpredictable to the cellphone's computer, you can get decent shots. Shot using the LG G5 of Minnehaha Creek in Hopkins, MN.
Cellphone Photos dSLR Compared
Here's my "Before" image. I prefer shooting in Manual mode, setting shutter speed, lens aperture, and ISO myself rather than letting the camera's computer decide for me. So I had been shooting tree branches against the sky when suddenly I saw a bunny nearby in the shade. I took a chance - it's digital, it's free - to see what I could do in Photoshop.
From around the bend using a dSLR-similar camera, the Fujifilm X-Pro2 with 35mm f/1.4 lens. The Fuji X-series uses a different pixel color arrangement. Most dSLRs use a Bayer array; the Fuji uses the X-Trans. The X-Pro2 is also a "mirrorless" camera. I find focusing on fast action is faster - you don't have to wait that split second for the mirror to flip up.