On the main screen type in:
1. *#06# - for checking the IMEI (International Mobile Equipment Identity).
2. *#7780# - reset to factory settings.
3. *#0000# - To know the Mobile model number and manufacture date
4. *#92702689# - shows the warranty
5. *43*#© - Activate call waiting
6. #43##© - Deactivate call waiting
7. #746025625# - To check weather your SIM Card supports clock stopping type
