What matters is -- is everything working perfectly? -- Is the signal booster helping the problem phones in your workplace? -- All phones now working fine?
One idea is that your BlackBerry may be sticking to 850 Mhz that it doesn't switch to 1900 until the 850 drops below 2 bars. That may be why you're not noticing any improvement. But it probably doesn't matter if your BlackBerry never had any problems in your workplace...
Or does it?
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