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How Global are Micro-SIM phone cards??

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Hello Fellow Travelers, I am finally going to replace my old stone-age cellphone and I'm looking for an unlocked GSM phone-- that will allow me to become a "local" in many parts of the world just by installing a local SIM card. Note that many US phones use CDMA, not GSM, and are made incompatible for use in other countries by non-removable software installed by US carriers (hence the term "locked").

OK I'm tempted by phones like the Samsung Galaxy S III but I see it uses a micro-SIM card, not the (still-customary??) larger, older-style SIM card.

So now I'm worried that micro-SIM cards are maybe not yet so common out there in other countries, although that will change in the years to come. So my quest to find a sort of "universal" phone would be frustrated because I may not be able to buy a local micro-SIM card for the new phone say in Morocco or Mexico?

Yes you can cut down a large older SIM card to micro-size but you also risk destroying it!

Business travelers out there-- any experience or tips, especially for the non-European world? The only Fodor's post so far is about central Africa.

Thanks and best wishes for stress-free travels.

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