Jonny Evans, writing for Computerworld:

If we take ComScore figures for January 2016 we see that around 198.5 million people in the US own smartphones. 52.8 percent of these use Android and 43.6 percent use iPhones, ComScore claims.

If we use ComScore’s figures as base we can make some estimates based on Fluent’s research. Fluent believes 29 percent of all iPhone users will definitely buy a new phone this year, and while 87 percent of them will stick with Apple (21.8 million), 6 percent will switch to Android. This suggests that around 1.5 million US iPhone users will make this switch.

And:

22 percent of Android users will “definitely” upgrade their device this year, and while 76 percent of them will stick with that platform, 17 percent will switch to iPhone. This works out to mean 3.91 million Android users seem likely to switch to Apple’s new iPhone this year.

1.5 million leave, 3.9 million arrive. Clearly, the wind is blowing from the Android shores toward the iPhone.