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The Code Key  Roaming Codes:

The Mobile Network Code is a 6-digit number used by GSM and other wireless networks. This code helps your phone identify on which network it should be operating.  The MNC is transmitted by the cell site and a list of codes is saved in the wireless handset.

The System IDentification Number is a 15-bit numeric identifier used by cellular systems to identify the home system of a wireless carrier and by the cellular telephone to determine its roaming status.  The SID is transmitted by the cell site.

The Preferred Roaming List, is a list of numbers stored in a CDMA wireless phone that determines how your phone will behave in certain geographic areas, whether or not it can roam and on what roaming carriers. 
The list is a set of SID's and a code of what to do when that SID is received. 

Roaming Tools Global Roaming Tools:
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The Global Travel Phone Get a phone that works anywhere in the world

Roaming FAQ Roaming and Roaming Code Questions & Answers

Roaming Tips How to Roam smartly around the globe.  Focus on your journey not your phone
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