Questions about switching to VOIP

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[quote John B.]I think most VoIP users will tell you to expect phone sound quality similar to that of a cell phone.
Can you explain that a bit more? I usually have pretty decent cell phones, so the quality sounds really good providing the other person is on a cell phone and not a cheap one. For example, T-Mobile users typically sound about the same as a POTS line, or worse. But Sprint users (which I am one of) sound much better than T-Mobile and always better than POTS.