It would depend on the type of riding you do I guess but there is no way in hell I would have my only means of contact with the outside world mounted on my handlebars.
My phone or a phone will always be with me.
I have been in one situation where there is no way a phone on the handlebars would have survived and another where if I was traveling a few KPH faster the bike and I would have been separated forever so I like to keep my phone on my person, there is no guarantee of service or that the phone will survive but it has a better chance of me being able to use it if needed.
Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.