As others have said, you can't. Full stop.
Trying to get "DSLR-quality" photos on a cell phone is a bit like trying to get automobile performance from a bicycle. They're different tools for different, but overlapping purposes. Small sensors (as used in cell phones) are fundamentally different than large sensors in a number of critical ways:
- Depth-of-field — cell phones can sort fake this to a limited degree by using multiple lenses and software trickery, but you have to be extremely lucky to get a shot where you can't spot something wrong, like a sharp area under someone's arm or a leaf that's blurred when it shouldn't be.
- Noise in low light — there's really not much you can do about this. You will never see a (competent) photographer trying to shoot pictures with a cell phone at a basketball game, or in other situations where high speed shots in low light are a necessity.
- Zoom/reach — cell phone cameras can't zoom, or at best support a menial amount of zoom (often digital). And although it is possible to attach zoom lenses onto the front of a cell phone, this inherently results in a lower quality image than if you design a long lens that focuses light directly on a sensor.
What these things mean is that although it is possible to get great shots on a cell phone, the very nature of such small cameras limits the types of shots that you can get. A good photographer will get great shots with a phone by knowing its limitations and working within those limitations, but that doesn't change the fact that for every such shot, there were probably a hundred that the photographer recognized were impossible and didn't even try to take them. The better the camera, the fewer such shots exist.
Also, ignoring digital trickery with its inherent limitations and often highly flawed renderings, it also tends to limit the character of shots by not giving you truly narrow depth-of-field. This limits the sorts of creativity that photographers have, forcing the photographer to be creative in other ways, such as composition and lighting. That's not necessarily a bad thing, but again, every time you cut down the number of colors in an artist's palette, you get fewer colors in the resulting painting, so to speak.
On the flip side, occasionally a cell phone can get a shot that a DSLR can't, by being able to stick the lens into a spot where a DSLR lens can't reach, such as shooting through fences, gaps in walls, behind furniture, and so on. So the differences between these technologies isn't entirely one-sided, just mostly one-sided.
Ultimately, the right camera is the one that gives you the shots that you want, and if a cell phone can do that for you, use that. If it can't, don't. Don't sweat the rest.