iPhone sales are almost always good, and when Apple reports 1st quarter sales on January 24th, all the signs point to some really excellent numbers.

Earlier this week, Verizon CFO Fran Shammo reported 4.2 million iPhone sales, which doubled the company’s 3rd quarter numbers. Some analysts estimate AT&T sold about 7 million iPhones, while estimates for Sprint are over 2 million phones. That’s more than 13 million phones in the US alone, and of course the iPhone is selling in much of Europe and Asia.

There are probably several factors contributing to robust sales. Extremely high customer satisfaction makes current owners evangelists for Apple products. The iPhone 4S with Siri created a lot of positive buzz, and there were very low prices on the older iPhone 3Gs.

All these projections are higher than those of the previous quarter and the numbers from 2010. Of course they are only projections, and we’ll know for sure when Apple lifts the curtain on the real numbers later this month.

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