How to Unlock a Sony Ericsson K770i

Written by michael bryant
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If you have a Sony Ericsson K770i and want to use it on other cellular providers, you must unlock it first. Unlocking a mobile phone and using it on another network is beneficial if you are travelling overseas and want to save money by using a local carrier in the country you are travelling to. The easiest way to unlock a phone is to obtain a code that works with your phone's specific International Mobile Equipment Identity (IMEI) number. After you unlock your phone, you will be able to use it with another cellular provider by inserting your new subscriber identity module (SIM) card into your phone. The Sony Ericsson K770i also features a key that can lock and unlock the phone from user access, which is different than unlocking the phone for unrestricted SIM card access.

Skill level:
Moderately Easy

Things you need

  • Unlock code
  • IMEI number

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    Unlocking for SIM Cards

  1. 1

    Go to the shop from which you purchased your phone. Many stores will provide an unlock code for your phone's unique IMEI number if you ask them.

  2. 2

    Call Sony Ericsson directly and request an unlock code from a representative. Tell them you are leaving the country and that you would like to use a new SIM card in your country of destination. Call Sony Ericsson from a phone other than the one that you are unlocking so you are able to follow instructions to unlock the phone.

  3. 3

    Try sites that offer codes to unlock your phone for a nominal fee. Go to the website and enter your IMEI number, which can be found underneath your battery. Purchase an unlock code, and wait for it to be sent to your e-mail. Enter the code into your phone.

    Phone Lock Code

  1. 1

    Switch the phone on.

  2. 2

    Enter the default code, 0000, when prompted for the lock code.

  3. 3

    Change the default code under the settings menu.

Tips and warnings

  • SIM unlocking a Sony Ericsson phone does not void the warranty (it can, however, for certain manufacturers).

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