So sprint is offering a free upgrade towards the 6/6+. Would I still have to pay the ETF if I wanted to change my plan to the $50 unlimited one that is iPhone exclusive?
Don't have the answer to your question. BUT DO THIS in stores. DO NOT go through their site. Or you will be waiting for months with zero info from them. Sprint has been awful with this shit.
Not sure if you can go to Best Buy or Target or some other store (that has the Sprint model), and if they will allow you to upgrade your account using that deal. But if you can, do it that way. Use this site:
http://idevicechecker.com/
What's up with the 'No Service' message? did you update to 8.0.1?
They fixed that. The new iOS update no longer bricks service. I upgraded my brand new phone yesterday to it, no problems.