I originally bought a Koala mount for my Galaxy S9+ and my wife's iPhone without considering the size. It's fine without the phone case, but the phone case didn't fit. Easy to fix. Send back the Koala mount and get the Koala 2.0 mount. It's a lot thicker and even has cool sticky rubber tabs that you can tuck in to accommodate when there's too much room. A great solution for storing my phone without taking up space on my bedside table.
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