Actually many wifi cards are dual band...I only know of Intel cards offhand but the 3945 is dualband (a5/b/g) and the 4965 is dual band as well (a5/b/g/n2.4+5) If you have a centrino platform, you have one of these cards (unless it is a very early Centrino platform), If you have Centrino with N support - you are definitely dualband
The phone has 256MB of RAM and a 1GHz processor, which do the job reasonably well, though the Anna interface will likely leave something to be desired for many smartphone users.
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Actually many wifi cards are dual band...I only know of Intel cards offhand but the 3945 is dualband (a5/b/g) and the 4965 is dual band as well (a5/b/g/n2.4+5) If you have a centrino platform, you have one of these cards (unless it is a very early Centrino platform), If you have Centrino with N support - you are definitely dualband