Apple fans are amped. The computer and gadget maker is expected to announce a new, more powerful version of its wildly popular smartphone this week — more than a year after it unveiled the iPhone 4.

Last week, Apple Inc. e-mailed invitations to a media event at its headquarters in Cupertino on Tuesday morning. The invite says "let's talk iPhone," implying the normally secretive company intends to show off the latest version of the device. In the past, Apple has typically introduced a...


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