*#06# IMEI checking code
*#79# S/W Version checking code
0124 Master Code
*#85*364# (*) Engineering mode Access code (Press last button for 3 secs)
85558555#(*)-hold

VG107
855855# without SIM

VG207
4268#(*)-hold

VK 900
*#85*87863# (удерживая # нажать *) - "1" Configuration ==> "9" Cus Reset..

Unlocking Phone lock:
Insert SIM card and Power on the handset
Enter SOS key when "password" windows pops up
Enter 85558555#* or 4268#* (Press last button for 3 secs)