I just wanted to give a quick example of the use case that I've had using my iPhone 4, and why this is important to me.

....

In the morning I mount my phone to the bike and head out for the day.

Using the app, Runtastic I am able to record my route, calories, speed, elevation, distance, and duration, and see the current time. This information I then use to track my fitness levels for the week (and I can share it on social media for my friends and family who care).

I can also plug in my headphones and catch up on podcasts, news, or music (traffic permitting). If this wasn't enough, I can also now use iPhone 6 in combination with an external battery to say, "Hey, Siri" and request that she do things like send emails, texts, or check on information I might be wondering about. All spoken back to me in my headphones.

I also use and app called 2Do. This uses geofencing to tell me if I am near something that requires my attention. For example, on my ride home I might pass by the grocery store. 2Do will send me a notification letting me know that I have tasks to compete at the grocery store. If my phone was in my pocket/bag I would have to stop (if I even heard it) and check to see what the notification was for. With a mounted solution I can look down at a stop light and see that I need to make a detour to grab Lucky Charms cereal.

On the way home, I might get a call from my girlfriend letting me know that the cat ate the salmon that was thawing on the counter, and that I need to pick up some sandwiches. I can easily see who is calling, and answer the phone (via headphones). The same goes for texts, and Facebook notifications.

Finally, lets say that I need to go out of my way to pick up a gift for my mums birthday. At work, I can create a route on Runtastic.com and upload it to my phone. Now, I have a route that I have chosen to be the best for cycling, instead of relying on Google Maps to choose the best route. I can look down and easily check that I am going in the right direction, all the while staying clear of major traffic.

For me, this has made my commute that much more enjoyable and safe. Sure, I might not take advantage of all these on all days, but having the option is really nice.