I have a Sprint 8703e and my wife uses my old BB on TMO. Pricewise they are the same monthly cost $29.99 but that's only because I got my 8703e through Sprint Relay. We have had the TMO plan for almost 3 years and have never has any problem with it. The Sprint 8703e also works well. Either one will work better than your Sidekick.
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Scott!
T-Mobile 8520
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