I was always under the impression that IF you DID NOT pay FULL retail value for your device you lose your unlimited plan! Any glitch WILL be corrected. You can claim ignorance but is it really worth losing your unlimited plan???
The grandfathered unlimited is only continued when you pay FULL RETAIL for your device, so if you UPGRADE and take advantage of the subsidized device you will be SOL!
If you upgrade your phone instead of paying full the full cost.........you will subject to the terms and conditions of big red....you will hear the music playing as they take away your unlimited data plan.
You will call to complain how it was there fault, it was online so it must be true, that is when the service reps voice will change...
You have been assimilated....resistance is futile!
LOL
So go ahead and roll the dice with that unlimited plan....