Verykool R25 - Manual (Page 7)

1 Start Using
Battery
Battery is attached with the phone. Please recharge it for use after
completely using up the battery for the first three times, which
makes this battery easier to achieve the best using state.
In actual use, the standby time and talk time of the phone varies
with the network status, working environment and different using
manners.
For installation of the battery, you should put the back of the phone
upward, turn the screw anticlockwise with finger to unlock the cover
according to the mark on the rear cover, and then take off the rear
cover according to the chat below. Then insert the battery in place.
After install the rear cover, you should turn the screw clockwise to
lock the cover.
Note:
Please do not screw the bolt with tools.
SIM card
The SIM card is the key for accessing to the digital GSM network.
Prior to using the phone, you need to insert effective SIM card
in the phone.
In order to prevent illegal use, SIM card adopts PIN code (personal
identification code) encryption protection.
If this function is selected, PIN code should be input correctly each
time when you power on the phone, thus to unlock the SIM card for
3