Shipments of Apple's iPhone 6 and iPhone 6 Plus are expected to surge to 71.5 million units in Q4 2014 before the company decreases shipments to an estimated 49.4 million units in Q1 2015, says a new report from KGI Securities analyst Ming Chi Kuo.

According to MacRumors, the analyst also estimates that the iPhone 5c and iPhone 4S will experience quarter-over-quarter growth in Q1 2015 before Apple ceases production of both phones during the year.

Kuo also notes that he expects shipments of the iPhone 6 to outnumber shipments of the iPhone 6 Plus by a 2:1 ratio: “We attribute the shortage of iPhone 6 Plus partly to less smooth production than iPhone 6. Moreover, while iPhone 6 Plus attracted greater attention when it was launched, we think more consumers will prefer iPhone 6 as they can operate the handset with one hand. Eventually, iPhone 6 shipments will outperform those of the iPhone 6 Plus model.” Sales of the iPhone 6 and iPhone 6 Plus topped ten million during the launch weekend for both devices, with the larger model seeing supply constraints. However, shipping times for the iPhone 6 Plus improved last week, with the 16GB model showing a shipping estimate of 7 to 10 days and the 64GB model showing an estimate of 2 to 3 weeks.

A survey of U.S. customers done by Consumer Intelligence Research Partners (CIRP) earlier this month also noted that U.S. customers are favoring the iPhone 6 over the iPhone 6 Plus by a 3:1 ratio.