nem.
"Generally, phones can be locked to accept only SIM cards based on the International Mobile Subscriber Identity, which has elements of:
Mobile country code (MCC; e.g., will only work with SIMs issued in one country)
Mobile network code (MNC; e.g., AT&T Mobility, T-Mobile, Vodafone, Bell Mobility etc.)
Mobile station identification number (MSIN; i.e., only one SIM can be used with the phone)"
http://en.wikipedia.org/wiki/SIM_lock
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Unix is user friendly - it's just picky about it's friends.