One in 10 Apple iPhones sold in the US in September went to owners hoping to unlock the device for use on networks other than AT&T, an analyst has claimed.

Piper Jaffray analyst Gene Munster believes "roughly 10 percent" of all iPhones sold in September were destined to be unlocked, although he bases his analysis on speculation.

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"During our store checks we noticed many people buying iPhones in the maximum five per customer allotments, which we believe were being purchased to be unlocked and operated on carriers other than AT&T," he writes, as reported by ArsTechnica.

Italian Mac website setteB.IT reports that sales of the device climbed 56 percent at Apple's biggest retail outlets after Apple contentiously cut prices on the product on 5 September.

That report predicts Apple will sell 10.5 million iPhones in the US alone next year, anticipating as many as two million sales by the end of the first weeks of November.