Virgin Mobile - Will phone upgrade solve web browsing issues?

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http://androidforums.com – I'm on Virgin Mobile and am currently using a Samsung Intercept my dad gave me when he upgraded. The phone is terribly sluggish, and web browsing is completely intolerable on 3G, and only occasionally useable over Wifi. Web browsing is more or less the only reason I want a smartphone, so I'm hoping the phone is the chief culprit when it comes to my horrible speeds. However, I've read that Sprint's 3G network (which is what VM uses) is the slowest of all the carriers, so I'd rather not spend the money on the new phone if it will only marginally increase web browsing speed. I've got my eye o (General)