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I'd like to know if android phones are sim-locked. Given that they are open-source and have community images it should be 'tricky' to sim-lock one but I prefere to ask.

Also - do I need to unlock if I use dual-sim adapter with one legal card in it?

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This differs from carrier to carrier. Some will be sim-locked, some aren't. You'll have to ask your carrier. It has nothing to do with the OS.

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Short of inserting a SIM card from another carrier, how can one tell whether an Android phone is SIM locked? – Derek Mahar Apr 19 '11 at 10:07
@Derek: Call your carrier. But if you got the phone subsidized, it's probably locked. Wikipedia has some information about relevant laws. – idbrii May 10 '11 at 2:57

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