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There is a multitude of reasons why you should unlock your phone. First and foremost, unlocking your phone increases the resell value of your phone and enlarges the prospective audience of buyers by not restricting sale to a certain networks' customer. Secondly, when traveling abroad, you will be able to switch SIM cards to a local network to avoid international roaming charges. Lastly, unlocking empowers the owner with the ability to switch networks without having to purchase a new phone or be locked into long contracts.
When the purchase price of the mobile phone to the consumer is subsidized with revenue from subscriptions, operators must recoup this investment before a subscriber terminates service. In order to secure their invest subscribers will implement a software feature on the handsent to lock usage to the subscribers network. Such subsidies are worth up to several hundred US dollars and in the same respect is the reason why carriers charge an early termination fee; another form to recoup the subsidy investment
Insert a SIM Card from a carrier other than the one your handset is locked to. When power up is complete the handset should display one of the messages below:

- 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.

It is a software capability built into GSM phones by mobile phone manufacturers. Network providers use this capability to restrict the use of these phones to specific countries and network providers.
An Unlock Code is a numeric string. When entered into a locked handset it releases the SIM lock restriction and allows the handset to be used on other GSM carriers.
An Unlock Code will SIM Unlock the handset from the original locked network, to be used on other GSM networks. *

-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

No technical knowledge is needed to unlock your phone. In most cases it is as easy as powering the phone on with the SIM card you want to use and enter in the code we give you when the phone ask for it. Some models require more steps but we will provide clear and accurate instructions and help you all the way through the process.
Yes, after you successfully enter the unlock code, the phone is permanently unlocked.
Yes, the original network is still compatible for use with the phone after unlocking.

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

-Europe

900 MHz , 1800 MHz, & 2100 MHz

-North America:

USA 850 MHz & 1900 MHz

Canada 850 MHz , 1900 MHz

-South America:

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

No, unlocking will not void a manufacture warranty.
It depends on the level of repair done to the handset. If the main board can not be repaired and will need to be replaced, the new main board will have an IMEI number separate from the one sent in for warranty repair and a new unlock code would be required. If the main board is not replaced normally the phone will stay unlocked, in the event it is not, then the customer can use the original unlock code that was purchased for reuse.
No, OEM software/OS updates will not lock the phone. In the event that the phone does lock again, the customer can reuse the original lock code purchased to unlock the phone.
The cost of unlocking a handset varies upon availability of the SIM unlock code. Some networks will release unlock codes based upon age of the phone or requirements of the subscriber. Typically in the these cases the price per unlocking is relatively low compared to other options. In the other instances the network will not release the unlock code because of strict eligibility requirements or exclusive sales arrangement with manufacture or a multiude of other reasons, then the unlock code must be obtained through the manufacture of the phone. The manufacture in most cases will be more expensive than acquiring through the network. Additionally not all networks follow the same eligibility requirements or will not release the unlock code under an circumstances. In this event, all models no matter the age of the handset will be requested through the manufacture.
Currently, we use PayPal to facilitate all of our payments. If you have a PayPal account you can pay by Debit/Credit or Bank Account. If you do not have PayPal, you can checkout as a guest and use Visa, MasterCard or American Express.
If the order is under process, it can NOT be canceled. Our site will send an email to customer informing them exactly when we began processing their order, until that time, the order can be canceled.
In the rare instance that the unlock code does not work, (less than 1% of the time) we will provide the customer with troubleshooting techniques to diagnose the problem. If we can not fix the issue, we will request video proof of the failure in order to process a refund with our vendors.
No, unlock codes do not expire.

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)

A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. Note: If you enter the wrong PUK code 10 times in a row, your SIM card will be invalidated, and you will need to purchase a new SIM Card. The phone will display the following error: "PUK blocked call operator."
The Digital Millennium Copyright Act, introduced an exemption on November 27, 2006 specifically permitting unlocking of cellular devices. The exemption was scheduled to expire on October 27, 2009, but was extended on an interim basis, because the Register of Copyrights had not yet completed its triennial review of DMCA exemptions. In July 2010, the Librarian of Congress extended the DMCA exemption for another 3 years.