Not even 'sponsored data usage' would encourage me to use an amazon phone if the UI is based on the fire tablet OS. And that's coming from someone with amazon prime, who uses amazon MP3, and occasionally watched movies on Prime Video.
There's no reason that Amazon Prime members should be paying for this "service" if they're not using it. If it turns out that's why the rest of us are getting a price hike, I'm done with Amazon.
I think they could succeed in tying their many services into the phone if the price was right. I'd certainly consider trying a new service when my current contract ends
Why does Amazon feel the need to expand past offering a decent video service and a great online shopping experience? Somebody's getting money hungry...