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A report from Consumer Intelligence Research Partners suggests that if it weren't for the Apple iPhone making its long awaited appearance on T-Mobile's line-up, the carrier would have lost 300,000 to 400,000 current subscribers to other operators that offer the phone; the actual figure could have been much higher...
Source: http://www.phonearena.com/news/Study-Apple-iPhone-saves-T-Mobile-from-losing-up-to-400000-customers_id46028