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I meant how they work without sim cards! Like the sim card has the number associated to it, thus easy to take it out and put it in a diff phone etc.

Never knew how a phone would know it was you without one.

I have always wondered the same thing?! Like if we loose our phone here, we just replace the sim and stick it in a new phone... I dont get this no sim thing at all!!
 
I'm keeping my factory unlocked iPhone 4 for now, but definitely getting the SGS2 on the 18th...
 
Depending on the screen size of iPhone 5. If it is 4 inch, I'll upgrade. If it is merely token increase like 3.7 inch, I'll keep using my iPhone 4 and make decision again next year.
 
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