Are you thinking of upgrading to Apple's upcoming iPhone 5S or iPhone 5C, expected to be announced in early September? One handset trade-in firm is offering customers a guaranteed price on their current iPhones despite the usual drop in value following new product releases.
Gazelle said Monday it will lock-in pricing for iPhone trade-ins through Oct. 15, giving consumers time to wait until the iPhone 5S is announced before sending in their current smartphone...