Earlier this week, Forbes writer Philip Elmer-Dewitt collected third-quarter iPad sales estimates from some 39 different analysts — both amateur and professional — and laid out the tale of the tape ahead of Apple’s earnings report next week. On Wednesday, Dewitt collected third-quarter iPhone sales estimates from the same 39 analysts. Estimates range from the 15 million iPhones Needham’s Charlie Wolf predicted late last month to a record 20.25 million units suggested by Traderhood’s Nicolae Mihalache. The analysts’ calls average out to 16.9 million units, which would be just over double Apple’s iPhone sales in the same quarter a year prior. Apple sold a record 18.65 million iPhones in the second fiscal quarter of this year, and the company’s iPhone business brought in $12.3 billion in revenue.