USB 3G/4G Portable Broadband
Having used both extensively - 3G is ok (often marginally so), but 4G is a big improvement - not only improved DL and UL speeds, but ping times, responsiveness, capacity, etc. 4G coverage is rapidly expanding in the US and elsewhere - if you have availability of service suggest to seriously consider it.
Clearwire is the current network provider - with Sprint, Time Warner, and Comcast starting to resell services over the Clear network - so more service offerings and equipments to come.
IMHO -
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