for iOS 9.1 software

Answer a call by tapping the iPhone screen.
During a call, tap Audio and choose iPhone or Speaker Phone.
Turn off the Bluetooth device, unpair it, or move out of range.
Turn off Bluetooth in Settings > Bluetooth.
Unpair a device. Go to Settings > Bluetooth, tap next to the device,
then tap Forget this Device. If you don’t see the Devices list, make sure
Bluetooth is on.
Restrictions
You can set restrictions for some apps, and for purchased content. For
example, parents can restrict explicit music from appearing in playlists,
or disallow changes to certain settings. Use restrictions to prevent the
use of certain apps, the installation of new apps, or changes to accounts
or the volume limit.
Turn on restrictions. Go to Settings > General > Restrictions, then tap
Enable Restrictions. You’ll be asked to define a restrictions passcode
thats necessary to change the settings you make. This can be different
from the passcode for unlocking iPhone.
Important: If you forget your restrictions passcode, you must restore
the iPhone software. See .
Privacy
Restore iPhone