SpareOne is SIM unlocked, so it can accept SIM cards regardless of the GSM operator, and micro-SIM adapters are also available for iPhone users to insert their iOS SIM.
Of course, the easiest and cheapest thing to do is convince a friend to loan you their unlocked GSM smartphone and buy a SIM card when you arrive in the UK, and then Dublin.
We spotted a GSM Palm Pre with a Vodafone SIM card, which could mean everything or nothing.
The device independence afforded by the SIM has been one of the chief advantages of GSM networks around the world over the past twenty years, and we'd hate to see Apple succeed in killing that off in favor of some sort of locked-up iTunes nonsense, but let's be honest: if anyone could pull off that kind of coup, it'd be Cupertino.
If you travel to Canada and want cellular service for more than emergency use, then plan on purchasing a local SIM card and perhaps using Telestial or another International virtual GSM network provider for inbound service.
FORBES: How to Save Money on Mobile While Traveling in Canada
This is a company whose primary business is the provisioning of a global virtual cellular network for primarily corporate clients to offer deeply discounted voice and data GSM services through the use of specially engineered SIM cards and an intricate supporting infrastructure and software for least cost routing and simplified phone number schemes.
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Each has slightly different rate plans but it is still cheaper to buy a local SIM card, carry a second (and possibly a third) GSM phone, and have inexpensive communications.
FORBES: How to Save Money on Mobile While Traveling in Canada
Every GSM device (including 3G iPads), has an ICC-ID on its SIM card.
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Assuming that you have an unlocked iPhone 4 or 4S or Android GSM (which is usually unlocked when sold), you can insert a local SIM card and have local voice and data services at a fraction of the cost you would otherwise pay.
FORBES: How to Save Money on Mobile While Traveling in Canada
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