We have tried Collector 10.2 on iPad2 (iOS 7.0.4) and noticed a bug.
The service is on an ArcGIS Server 10.2.1. Under service properties -> 'Feature acces' the 'Allow geometry updates' is disabled.
While collecting a new point, it is locked to the gps-position. Nothing happens by tapping the map in order to move the point, that we want to create. If the 'Allow geometry updates' is enabled, the point is not locked to the gps-position.
We have tried the same on an Android device with the same version of Collector. There the point, that we want to create is not locked to the gps-position. This is the behaviour we expect.