Determine how long you have been on your current T-Mobile contract. T-Mobile will typically provide your device's "unlock code" after 121 days on your current contract.
Call T-Mobile customer service at its toll-free number; 1-800-TMobile.
Tell the customer service representative that you would like to receive the unlock code for your T-Mobile Dash. If you plan on using the device overseas, let them know that information as well--occasionally, they will provide the code if less than 121 days have passed if you are going overseas.
Write down the unlock code just as it is presented to you by the T-Mobile rep. Typically, the code will involved pressing a set of keys on your device in a specific order. For example, you may have to power on the device, hold down the soft keys and press a set of numbers, etc.
Input the unlock code just as provided. Insert another company's SIM card in your device if you have one available. Wait and see if the signal strength on your phone shows up, if it does, the device is now fully unlocked.
Visit an online "cell phone unlock retailer." One option is GSMLiberty, which is considered a trusted unlock vendor. However, you can find more sites by searching for "Unlock Code T-Mobile Dash" through any popular search engine.
Find your device by searching for the manufacturer and model number on the GSMLiberty. If you type "T-Mobile Dash" into the search bar at the top right corner of the main page, you will immediately be brought to your device.
Buy the unlock code from GSMLiberty. You will need to provide your device's "IMEI" number, which is located under your phone's battery. Wait for GSMLiberty to email the unlock code to you.
Follow the directions provided with the email. You will receive specialized software to unlock your T-Mobile Dash. Plug in your phone and follow the directions exactly as provided.
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