Roaming Zone - Cellular Roaming Codes & Travel

Codes & Tools for Using Wireless Away from Home & Out of the Country

System IDentification Numbers (SID List)
System Identification Numbers, or SIDs, are numeric codes used by cellular systems to identify the home system of a wireless carrier and by the wireless device to determine its roaming status. Our lists are updated as changes are discovered. Some entries are in the name of the legal office who represents the wireless company. In the US, cellular SID's were originally assigned and recorded by the FCC, but in 2003 they decided to privatize the function of assigning and recording cellular SIDs. Entries with expiration dates may have been renewed. Note: Some of these lists are large, but we have broken them into more download-friendly sizes.

International Wireless Roaming:
If you're roaming outside the US, we have the tools you need to roam wirelessly. Find the roaming capabilites of your current phone, roaming with your current carrier, and prepaid phones that can roam outside the US. Tap the knowledge of those who have gone before you, and don't overlook the wireless travel checklist before you leave home.

Cruise Ship Roaming:
You can use cellular on board a cruise ship but it can be quite expensive, especially if you use any data. Remember, checking email uses data. Connections are completed by satellite and pricing depends on your cruise line, phone model, plan and wireless carrier. We feature several low-cost alternatives.

	Roaming Tools:
INTERNATIONAL WIRELESS ROAMING WHERE ON EARTH CAN YOUR PHONE ROAM? PREPAID PHONES THAT ROAM GLOBALLY GLOBAL 'TRAVEL' PHONES AND SIM's NUMBERS YOU SHOULD HAVE ROAMING NORTH AMERICA ROAMING: CANADA, CUBA and MEXICO