Last Updated: Oct 18,2012
I tried: Su <enter>
getprop ril.MSL <enter>
Check out this thread and see if it helps. Also, you can try asking your carrier for the msl.
I am assuming you aren't rooted because if you were you could use MSL Reader.
There is a really easy way to do this, download meid converter from the market and it will calculate it for you when you enter your meid.
note:msl reader is only for htc phones
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