Tried a lot of phone holders and this is the one I find to be the best - iottie 3. Has never popped off after I put it on and is very stable. You can see I have it on my right door on the side, it's just wide enough. I used to use another sticky type one there but that would always pop off because of the texture and slight curve on the door. This one is pretty adjustable as well, I could pull it closer if I wanted to, but I think it's perfect where it is. The best part about the mount is the little legs you see at the bottom - I can push it lower and side to side to adjust for the height of my phone's buttons and charger location.

Last one I did for 80k in Jan, fairly standard (engine oil, oil filter, air filter, brake fluid) came up to RM524.20.