Here are statistics for Dec 1 2013 through Feb 11 2014.
My app is iOS 6+ (for recent version), you can see that majority of users already updated to iOS 7.
| Firmware Version | % of Sessions |
| iPhone 7.0.4 | 42.4% |
| iPad 7.0.4 | 15.2% |
| iPhone 6.1.3 | 9.5% |
| iPhone 7.0.3 | 5.0% |
| iPad 6.1.3 | 4.3% |
| iPhone 7.0.2 | 4.0% |
| iPhone 6.1.4 | 2.5% |
| iPhone 7.0 | 2.3% |
| iPad 7.0.3 | 2.3% |
| iPad 7.0.2 | 2.2% |
| iPad 5.1.1 | 1.5% |
| iPad 7.0 | 1.3% |
| iPhone 5.1.1 | 1.1% |
| iPhone 6.0.1 | 1.0% |
| iPhone 6.1.2 | 1.0% |
| iPhone 6.1 | 0.6% |
| iPhone 7.0.5 | 0.5% |
| iPad 6.1.2 | 0.5% |
| iPhone 6.1.5 | 0.5% |
| iPad 6.0.1 | 0.5% |
