Mobile SDK - Switching from iOS to Android
Why can't I switch pairing from an iOS to Android device?
If the pen has previously been paired to an iOS device, the device would still remember the pen even if it has been unpaired. The iOS application still wants to communicate with the previously paired pen and thus steals the pen's pairing attempt from other devices. The solution is to turn off the application running on the iOS device, or to temporary turn off Bluetooth on the iOS device.