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I don't use wifi a lot, but it can be useful. For example, I can surf on the Internet, check email, etc while on a call. Another use is to access files on a LAN which you can't do with EVDO unless you connecting through a VPN.
While I don't do VOIP on mobile phones, I suppose that wifi would be useful for that as well. It's a nice feature, but I wouldn't be heartbroken if I didn't have it.
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