I doubt MVNO's would ever lease bandwidth from the big ones without taking into account their long term growth forecasts - I imagine they've got 5/10/20 year ag

I doubt MVNO's would ever lease bandwidth from the big ones without taking into account their long term growth forecasts - I imagine they've got 5/10/20 year agreements in place with provisions for expansion at fixed rates - it's only if they begin to eat away at their quotas that they may change their fees / structure or and/or purchase more from the original network operator.