Las Vegas (CNN) -- The International Consumer Electronics Show, the giant gadget convention that wrapped up on Friday, has brought some frustrating news for AT&T or Sprint customers who bought a cutting-edge 4G smartphone last year.
That phone will soon be outdated.
AT&T Mobility and Sprint Nextel unveiled some of the first smartphones that will tap into their new, even faster fourth-generation networks.
But wait, Sprint has been talking about its 4G network since launching one in 2008 followed by its premier phone, HTC's Evo 4G, in 2010. And AT&T began adding "4G" to the names of many of its smartphones early last year.
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