FORTUNE -- For Apple (AAPL), the iPhone is a sale that keeps on giving -- at least in the U.S. Once a customer has bought one, he or she is likely to come back for another, usually within two years, when that contract expires.
The...
iPad replacement cycle: Like an iPhone? Mac? Or (worse still) TV?
How customers buy and use iPads affects the device's long-term prospects, says CIRP.
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