Select Menu > Settings and Connectivity > Bluetooth.
To block a device from establishing a Bluetooth connection to your device, open the
Paired devices tab. Tap a device you want to block, if it is not already highlighted,
and select Options > Block.
To unblock a device, open the Blocked devices tab, tap a device, if it is not already
highlighted, and select Options > Delete.
To unblock all blocked devices, select Options > Delete all.
If you reject a pairing request from another device, you are asked if you want to
block all future connection requests from this device. If you accept the query, the
remote device is added to the list of blocked devices.