There is a program that you must run on your Windows Mobile device, its called GetSPC. It can get your MSL# from your ESN#. Your ESN# is located under the System tab of the settings control panel called Device Information. Use the ESN# you find there as the input field once you run the program (try a Google search for it) and the Output is your MSL#. Once you have that you can follow the steps listed in several of these posts to locate and write down any information you should need.
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