- Enter Subsidy Code
- Enter Unlock Code
- Incorrect Sim Card
- Insert Correct Sim Card
- Invalid Smart Chip
- Phone Restricted
- Sim Network Unlock Code
- Sim Network Unlock Pin
- Special Code Required
- Wrong Sim Card
International Mobile Equipment Identity. The IMEI number is used by a GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing that network. The IMEI is only used for identifying the device and has no permanent or semi-permanent relation to the subscriber. The IMEI number includes information on the origin, model, and serial number of the device.
IMEI = 14 digits + 1 Check Digit
IMEISV = 14 digits + 2 Digit Software Version Number
IMEI + SV = 14 digits + 1 Check Digit + 2 Digit Software Version Number
The format of the IMEI is AA-BBBBBB-CCCCCC-D, 15 although it may not always be displayed this way. The IMEISV drops the Luhn check digit in favour of an additional two digits for the Software Version Number , making the format AA-BBBBBB-CCCCCC-EE. The IMEI+SV incorporates both the check digit and the additional two digits for the Software Verison Number, making the format AA-BBBBBB-CCCCCC-D-EE.
TAC = Type Approval Code
FAC = Final Assemby Code
SNR = Serial Number
CD = Check Digit
Where do I find the IMEI #?
On many devices, the IMEI number can be retrieved by entering *#06#, or it is located in the battery compartment.
Android: Settings --> About Phone
Blackberry: Options --> Status.
iOS: Settings --> General --> About
Sony Ericsson : Options --> status. Dial: * Right * Left Left * Left
What is SIM Card?
Subscriber Identity Module One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card containing the user's subscription information and phone book. This allows the user to retain his or her information after switching handsets.
-Add frequency bands for usage on CDMA/IDEN networks
-Give customer free services
-Remove Lost/Stolen Ban
-Remove user passwords from SIM card or handset
To determine compatible networks the customer will need to verify the compatibility of the frequency band from their handset and desired network.
GSM networks operate in a number of different carrier frequency ranges with most 2G GSM networks operating in the 900 MHz or 1800 MHz bands and 3G networks 850 MHz and 1900 MHz bands. In rare cases the 400 and 450 MHz frequency bands are assigned in some countries because they were previously used for first-generation systems. Most 3G networks in Europe operate in the 2100 MHz frequency band.
-Africa, Asia, & Middle East
900 MHz & 1800 MHz
900 MHz , 1800 MHz, & 2100 MHz
USA 850 MHz & 1900 MHz
Canada 850 MHz , 1900 MHz
Brazil 850 MHz, 900 MHz, 1800/1900 MHz
Costa Rica 1800 MHz
Ecuador & Panama 850 MHz
Guatemala, El Salvador, & Venezuela 850 MHz and 900/1900 MHz
Peru 1900 MHz
A Hard Lock is a permanent carrier lock. Your phone will become hard locked by attempting to enter an incorrect SIM unlock code more times than your phone allows, permanently locking the phone to the current carrier. Each phone manufacture has a different limit for the amount of unsuccessful attempts before the device becomes hard locked. The standard amount for HTC, Motorola, Nokia, and Samsung is 5 attempts. The standard amount for LG and Blackberry is 10 attempts. The messages below are examples of what a Hard Locked phone will display.
- (0 Left)
- Code Error, Please Wait…
- SIMLOCK block unlock reset KEY
- SIM network subnet unlock PIN
- You have tried 5 times, please wait for timeout...
- Unlock Attempt: 10 of 10
- Contact Service
- Contact Service Provider
- Number of Attempts Remaining: 0
- Tamper Alter
- Wait before Enter Special Code
- Cannot Undo Restriction
- Not Allowed
- This phone only accepts SIMs from specific networks, and has been blocked.
Contact your customer service center for the unblock code.
- Phone Freeze
- Could not unlock network - NCK (0)
- Network (0)