Medialets

We’ve crunched the adoption numbers for last week’s release of iPhone OS v3.1.3 and found that among the developers’ apps we track 14% of their users installed v3.1.3 between 2/1 and 2/6, with adoption growing steadily each day.

We also saw a drop of 13% in installs v3.1.2, meaning 87% of the upgrades to v3.1.3 came from users that already had v3.1.2.

The other interesting data point is that roughly 13% of these users are slow to upgrade their iPhone OS and are using a version prior to 3.1.2.