New data from Counterpoint Research reveals that the two devices launched on October 23 and saw strong enough sales to poisition them as the first and second best sellers within two weeks of their release.
In a blog post, analyst Varun Mishra wrote: "There is a large pent-up demand for 5G upgrade, especially within the iOS base, which is now getting converted into sales.
"This was complemented by strong carrier promos, especially in the US, which accounted for over one-third of the iPhone 12 and 12 Pro sales for the month.
"All carriers were offering the iPhone 12 for $0 through a mix of the trade-in and unlimited plans."
Mishra noted that sales are likely to "remain strong" towards the end of 2020 and into the New Year.
The post continued: "Going forward, the demand for the iPhone 12 series is likely to remain strong through Q4 2020, especially during the festive season in December.
"Strong sales for Apple will also drive the volumes in the premium segment, raising the global ASP.
"Due to the late launch, some of the sales will be pushed to subsequent months, thus maintaining the momentum of the iPhone 12 series in early 2021 as well."