Smartphone holder

Dear people, As 97 1100 RT-man, and since I haven’t driven around with a smartphone yet, and just got a Motorola G4 (which also has the Google Navi in it), I wanted to ask you if you have tips for the mount. e.g. with or without Waterproof case? or does the key feel not quite…? the side buttons? with or without sun protection?, with or without USB connection (to load)? with Bluetooth connection to the headphones (for directions)? od he can do this without? with or without vibration protection? better screwed directly to the handlebar bolts or is the “bike holder for something round” completely sufficient as a connection to the bike? Under 25K vibration is one thing that you might have to consider here, since in the city you rarely get beyond it, even with nicely balanced carburettors, and in the city you need the Navi most. am complete beginner in these things. Do you have advice/experience here? I w who of you is using the smartphone solution? e.g. without charging connection, does this work (battery-like) at all? Can you use a plug (12V) for this? maybe you have already dealt with it a thousand times, but I’m throwing it again in the round. I have it before business trips across De to Berlin and would like to make things a little easier! Thank you… Callum