There are some photos which are very personal you want to keep them only to yourself. If someone see them by chance, it becomes very awkward and embarrassing. To avoid that, you can simply install the Vaulty app and feel safe while handing over your phone to anyone:
There are two ways by which you can turn on Bluetooth in you phone
a. Go to settings.
b. Tap on "Bluetooth"
c. Tap the Toggle button to turn on the Bluetooth.
a. Drag down the quick settings bar from the top or bottom
b. Tap the "Bluetooth" icon to turn on/off the Bluetooth settings.
You can check more details about the phone here: Xiaomi Redmi Note 5 Pro
Xiaomi Redmi Note 6 Pro, the successor of Xiaomi Redmi Note 5 Pro is available at almost the same price and is a favorable choice since it has a larger display, latest processor, quick charging v3.0 and 80.68 % screen-to-body ratio.
You can see the detailed comparison here: Xiaomi Redmi Note 5 Pro vs 6 Pro