Swapping phones on virgin mobile (iPhone 4)?

I had an lg optimus v for vgmbl and just bought the iphone 4 for vgnmbl. Best buy activated the phone for me and everything works except the 3g. The 3g occasionally pops up but most of the time its a "o" symbol when it should be the other way around. I just noticed that 3g still works on my old optimus. Could it be that the signal is still going to my old phone instead of my iPhone 4?

No, its that the virgin mobile iphone is horrible.
its the worst version of any iphone out.

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