I completely understand. Before this I actually taped my phone below the motorcycle dash which was scarier because I had to reuse the tape again on the way back and it was coming off. I think it was a Note 2 at the time and those things were huge.

I have a nice attachment. It's got shock absorbing shit and everything. Clamps into place.

I also have waterproof saddlebags if it decides to rain, but I'm usually good at interpreting the weather.

You can get cases that cover the phone completely, like a bag with a clear plastic front. And you can use the screen through them, it's made of a material similar to a soft screen protector.