Yes, force Sprint to give it to you by calling them from another phone and saying that when you try to make a call you're getting a message about your account not being active. Be polite but firm and prod them into the conclusion that maybe you need to reprogram your phone. 99% of the time they will agree with you.
In the reprogramming process, when they give you a number that starts out ## write it down. It will be in the format ##123456#, and those six numbers in between the # signs are your MSL.
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