Thanks for the informative reply!

I do understand the price point is not going to give me a reliable device. I didn't know an unlocked phone could be used on a pre-paid plan. I figure I'd give it a try to see if I can live with the system before investing more heavily.

One of the reasons for me to go the tablet route is that I'm repulsed by anything mounted to either of my fixed gear bikes...lights, cycle computers, bags, etc. just detract from their simple, clean look and over-the-shoulder portability. Pump, tools, tubes, water, blinkies, etc. all ride in/on my bum bag. The heat & vibration factors should be limited.

Good to know about the elevation difficulties...thanks, will look into a suitable cross-referenced app for the data.

Battery life is an issue, but I'll see what happens and make course corrections as necessary. Two hours is long enough in this Winter weather, but Spring does make for longer outings!

Thanks again for your input!