If you use a protective case for your phone, you must take that into consideration when shopping for a mount. Due to the many sizes & shapes of phones and cases, finding one that has a secure fit can be a problem. Yes, there are many "universal" X grip or clamp style mounts available but in my experience, they just don't hold up well to the vibration of a bicycle handlebar.
After retrieving my phone on several occasions after it fell out of one of these universal mounts, I discovered a fairly simple way to securely hold my iPhone 10s with Otterbox defender case. I used the belt clip that came with the Otterbox and these parts from RAM:
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I fastened the RAM plate to the back of the belt clip
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and mounted it to the handlebar using the RAM hardware
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The mount articulates freely for the best viewing angle, the phone is easily removed from the mount with the flick of a finger and the mount itself is easily moved to another bike if desired.
The example above is for an Otterbox case but the same idea would work with almost any phone case that has a belt clip.