Some MMI codes act locally on the device itself, some are sent to the SIM card, and others are sent to the network operator.
Confirm if the device is network locked
These are network-level codes that interact with the GSM network infrastructure. These codes are network-specific and it is up to each network operator to choose USSD codes and to provide the relevant services that the USSD code interacts with.
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USSD codes are most commonly used to check airtime balances or to load prepaid airtime. These are codes that are specific to your phone model or are universally used by the GSM network and are hardcoded into the operating system of each device. Similar to manufacturer-defined MMI codes, SIM control codes are also executed immediately the last character is entered. This example will change your PIN number from to Staff-authored articles are either works-in-progress, collaborative efforts or short notices, documents and other material that has not necessarily been authored by anyone at Intertel.
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Asphalt 8 Airborne Hack Tool. This policy exists to make it more difficult for retailers to export devices from one country to another. If you have a region-locked device, you can remove the region locking restriction by inserting a European SIM card and making at least a 5-minute phone call. For more information, please see our in-depth guide to mobile phone unlocking.
We'd love to hear your thoughts and any questions you may have. So far, we've received comments from readers.
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You can add your own comment here. Hi, I recently bought Samsung s9 plus from uk Tesco network locked but it was in UK and when I started using in India by inserting Indian network sim, it was asking sim network pin and after two wrong trials end up asking asking puk code. Is there any chance to unlock sim locked puk code from India? Please help me out Thank you. Hi there, Is this a problem with your SIM card being blocked?
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Hope this helps, Ken. Hi there. However the buyer as infromed me that the phone is locked outside of O2. Hi Sean, Thanks for your comment. You simply need to provide the IMEI number to O2 and they should be able to generate an unlocking code for you. Hope this helps!
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Load more comments Save my name, email, and website in this browser for the next time I comment. Your e-mail address will never be published. By default, I'll use it to send you an update when there are replies to your comment. However, if you don't want to receive this, you can disable it using the dropdown menu below:. Don't subscribe All Replies to my comments E-mail Notifications optional. Contents 1 Benefits of Unlocking 1. Your Comments so far We'd love to hear your thoughts and any questions you may have.