First off: good light. If you're shooting in poor light, you're going to get poor photos. Tell the phone what to focus on. Don't just hold the phone up and click. Tap to select what in the frame should specifically be sharpest. And while you're there, adjust the exposure by sliding up and down. Deeper blacks will make things look sharper, and phones tend to want to make a photo brighter when left to themselves. Don't use the physical buttons to activate the shutter. I know Apple just introduced a dedicated physical camera button and that was a big focus of the marketing, but if you're after the sharpest photo you can get, do not use that button to shoot. Or the volume buttons. Use the onscreen shutter button. And don't tap it. That shakes the phone, too. Try to think of it as just TOUCHING the screen. Even better, if you have the option, put the phone on a tripod or lean it on something and use a remote to activate the shutter. But, if you're hand holding, don't hold it out at arm's length and shoot. Hold the phone with BOTH hands, tuck your elbows into your body to brace, hold the phone closer, slowly exhale and at the same time you're breathing out, touch the shutter button. Answer from Orson_Randall on reddit.com