Apple could have sold far more iPhone 4s at launch if it had been able to keep up with production demands, argues Kaufman analyst Shaw Wu in a new memo. The company sold 1.7 million units between Thursday and Saturday, beating the pace of earlier iPhone launches, and typical analyst forecasts between 1 and 1.5 million units. Wu estimates however that if Apple had invested in better production levels, it could have sold anywhere between 2 and 2.5 million phones. Shortages continue to hamper sales, since the device is virtually unavailable in some areas.