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Unlocking a simple mobile phone in 2024 typically involves contacting the carrier from which the phone was originally purchased and requesting an unlock code. You'll need to provide certain information about the phone, such as its IMEI number, which can usually be found by dialing *#06# on the phone's keypad. Once you have the IMEI number, you can contact the carrier's customer service department and request an unlock code. They may require you to meet certain eligibility requirements, such as having an account in good standing or fulfilling any contractual obligations. Once the unlock code is provided, you can follow the instructions provided by the carrier to unlock the phone and use it with a different carrier's SIM card. Keep in mind that the process may vary depending on the carrier and the specific phone model.