Mark Lowenstein, an analyst at Mobile Ecosystem, said the Jump! upgrade program at T-Mobile will help retain customers. "T-Mobile is clearly tapping into the group of subscribers who would upgrade more frequently if they could," he said. "Certainly T-Mobile will steal some subscribers" from other carriers. "A subscriber who is on a plan and then additionally investing $120 a year [$10 a month] for the privilege of an early upgrade is less likely to churn."
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