It’s “iPhoneapalooza 8” time.

Apple will unveil the 10th-anniversary iPhone at 1 p.m. EST Tuesday. Once again, resale sites have reported a surge in trade-ins of old iPhones ahead of the announcement, but they expect trade-in prices to drop in the days after the big event. For now, though, consumers can still lock in high enough prices to earn 50% back on the cost of the new iPhone by trading in their old gadget and upgrading to a new phone.

The market has become crowded for old phones in 2017, however. In previous years, it was pos…
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