The HTC Thunderbolt is important for one reason: 4G. But that one reason promises to change the way mobile phones are used, the same way that the move from dial-up to broadband at home led to a completely revolutionized computing experience. The Thunderbolt is, on the whole, a really nice phone: it takes proven hardware and taps it into Verizon's ludicrously fast LTE 4G network. But should this be your next smartphone? Well…maybe not.