Sprint did ruffle a fair number of features in the past when they rolled out the HTC EVO 4G smartphone back in 2010, where plenty of prospective customers were pretty upset when they were billed a $10 monthly “Premium Data” charge, even for those who reside and work in places where there was no 4G coverage. According to Sprint, this was done because the advent of 4G technology means more data bandwidth will be used with the new smartphone, hence the “necessary” monthly charge when it comes to an unlimited 4G data plan. Expect more and more unhappy customers to voice their concerns when Sprint extends the Premium Data charge to all smartphones from January 30th 2011 onwards. Bear in mind that the “unlimited” bit here isn’t as it seems, as your data connection will be throttled – dropping down to 3G whenever you hit a preset data limit. If you’re a heavy streaming user, then expect this to happen to you monthly and way before the next billing cycle.