Completely forgot about this tweak. Another reason to jailbreakNoAnnoyance (Cydia) blocks quite a few of those popups. It might cover that one.
...Or if iOS automatically communicated with your wireless carrier and adjusted itself accordingly.Completely forgot about this tweak. Another reason to jailbreak
It would be a nice feature if Apple had a sub-setting which allowed users who have unlimited data to preset a toggle which would disable data usage warnings throughout iOS.