Manualsbrain.com
  1. Manuals
  2. Brands
  3. Sony
  4. 1904
  5. User Manual

Sony 1904 User Manual

Download
Page of 108
1
Before you start, make sure to back up any important data that is saved on the
internal memory of your device to a memory card or other non-internal
memory.
2
From your Home screen, tap  .
3
Find and tap 
Settings > Backup & reset > Factory data reset.
4
To delete information, such as pictures and music, from your internal storage,
mark the 
Erase internal storage checkbox.
5
Tap 
Reset phone.
6
To confirm, tap 
Erase everything.
Locking and protecting your device
IMEI number
Every device has a unique IMEI (International Mobile Equipment Identity) number.
You should keep a copy of this number. If your device is stolen, your network
provider can use your IMEI number to stop the device from accessing the network in
your country.
To view your IMEI number
•
Turn off your device, then remove the battery cover and battery to view your IMEI
number.
•
Open the phone dialer on your device and enter 
*#06#
.
To view your IMEI number in the device
1
From your Home screen, tap  .
2
Find and tap 
Settings > About phone > Status.
3
Scroll to 
IMEI to view the IMEI number.
SIM card protection
You can lock and unlock each SIM card that you use in your device with a PIN
(Personal Identity Number). When a SIM card is locked, the subscription linked to the
card is protected against misuse, meaning that you have to enter a PIN every time
you start your device.
If you enter the PIN incorrectly more times than the maximum number of attempts
allowed, your SIM card will become blocked. You then need to enter your PUK
(Personal Unblocking Key) and a new PIN. Your PIN and PUK are supplied by your
network operator.
To lock or unlock a SIM card
1
From the Home screen, tap  .
2
Find and tap 
Settings > Security > Set up SIM card lock.
3
Mark or unmark the 
Lock SIM card checkbox.
4
Enter the SIM card PIN and tap 
OK.
To change the SIM card PIN
1
From the Home screen, tap  .
2
Find and tap 
Settings > Security > Set up SIM card lock.
3
Tap 
Change SIM PIN.
4
Enter the old SIM card PIN and tap 
OK.
5
Enter the new SIM card PIN and tap 
OK.
6
Re-type the new SIM card PIN and tap 
OK.
101
This is an Internet version of this publication. © Print only for private use.