Level 2 Service Manual
GALAXY ASTRAL GEO-GEO WAP
12312312 = Indifferent serial number
2°) Group IDentifier 1 (GID1):
This data field can contain digits or letters which identify a family of SIM
Ex : XX for a type for of prepaid SIM card of Service provider Y
3°) Group IDentifier 2 (GID2) :
same as GID1 to identify a sub family of SIM.
Then, from this information, we have 5 types of latch :
1°) Network Level :
latch on MCC MNC of IMSI of the SIM only
(ex : only the cards 208 01 be able to operate the mobile.
Mitsubishi use to call this latch NCK (NCK stands for " Network Control Keys" and is the password to
lock the mobile at the network level)
2°) Network Subset Level :
Latch on MCC, MNC and digit 6 and 7 of the IMSI
Ex : latch on 208 01 55, only the SIM cards with an IMSI starting with 208 01 55 will operate the
Mitsubishi use to call this latch NSCK ("Network Subset Control Key)
3°) Service provider level :
latch on Network (value of MCC MNC) and value of GID1 data field.
Ex : latch on the value "XX" in GID1 and MCC MNC=208 01, only the SIM cards of service provider Y
with XX stored in data field GID1 will operate the mobile.
Mitsubishi use to call this latch SPCK (Service Provider Control Key)
4°) Corporate Provider Level :
latch on network (value of MCC and MNC) and a value stored in GID2
Mitsubishi use to call this latch CPCK (Corporate Provider Control Key)
5°) IMSI level
latch on the complete IMSI of one SIM card.
Only one SIM card corresponding to the correct IMSI operates the mobile. Usually, this latch is done in
an automatic way (the first SIM card inserted in the mobile is the only SIM which can be used by this
General information :
To lock /unlock a mobile, you need 8 digits password for each level concerned, and each mobile (one
set of passwords for one IMEI). These passwords are calculated with a special algorithm. You have
only 10 attempts to unlock correctly a mobile. After 10 unsuccessful attempt, the mobile is
To enter the unlock procedure, you need to access special menus with specific access codes.
Mitsubishi Electric Telecom Europe SA
ZA le Piquet, 35370 Etrelles
Phone: +33 2 99 75 71 00
Fax: +33 2 99 75 71 47