AT&T将这类客户称为 “早期升级用户”（early upgrade customers）。
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early upgrade customers
早期升级客户
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In preparation for the iPhone launch, the carrier has started offering early bird discounts on the device to select iPhone customers who want to upgrade before the end of their two-year contract period.
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