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Unlocking the modem MTS 423S (Huawei E3531, Megaphone M21-4).

The unlock code (NCK code) allows you to unlock the MTS 423S modem
(Aka Huawei E3531, Megafon M21-4) for working with SIM cards of any other operators.

******************BEFORE THE PURCHASE********************
1. Make sure you really have MTS 423S (it's also Huawei E3531, Megaphone M21-4).
2. Prepare IMEI-phone number. IMEI can be viewed on the case of the modem, or in the program that was opened after installation on the computer. Write it correctly, with no omission.
3. Make sure that there are attempts to enter the code in the modem.

**************** UNLOCKING CODE RECEIVING PROCEDURE ****************
After payment for the goods, you must fill out the form, specifying in it the following information:
1. IMEI modem (without errors);
Once again, carefully and without errors fill out the form and press the "Send" button.

**************** PERIOD OF RECEIPT OF CODE 5 PIM MINUTES - 3 FRAMES OF HOUR. *********************
Work hours are from 9-00 to 18-00 Moscow time. After this time and on Sunday the code MAY be processed a little longer, but the code will be, be sure.

************** UNLOCKING MODEM MODE MTS 423S (aka Huawei E3531, Megaphone M21-4) **************
1. After receiving the NCK unlock code, insert the SIM card of another operator into the modem
(If the PIN on the SIM card is enabled, enter it.)
2. Then the window ("Enter NCK-code") appears and enter the received NCK-code.
3. Confirm the input.
4. Congratulations! The phone was successfully unlocked.

Alternative method of entering the code:
Send AT ^ CARDLOCK = "nck code", where "nck code" is the code sent to you by email.

Before making a purchase, it is highly recommended to check if the modem asks for the unlock code when a SIM card of another operator is installed in it.
When making a purchase, you agree that the model of your MTS 423S modem (Huawei E3531, Megafon M21-4), as well as attempts to enter the unlock code, are not used up to zero.
If after the purchase of the code it turns out that attempts to enter the unlock code are NOT REMAINING, the error in the model or in the IMEI - the service is considered to be executed in 100% volume and the funds are not refundable!
The code is guaranteed on the "factory" firmware, that is, you need to flash and patch the dashboards after unlocking.
Immediately after payment you will receive a form to fill in the registration data, which will need to fill in the following fields:
- E-mail address (email);
- Enter the IMEI;
These data will be transferred to the seller to complete the transaction of purchase and sale of goods.