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		 Verizon sells 3 phones that can use GSM overseas and CDMA in the US. International roaming using a CDMA phone is pretty spotty.  
 
You'd have a wider variety of phones using a GSM carrier, since probably 25-50% of their phones would be tri-band or quad-band, which is what you'd need if you're going to Europe or Asia. That would be T-mobile or Cingular. Cingular coverage in the US itself is generally better, but it depends on where you'd be using it most of the time. I know around here T-mobile is pretty shitty. I glanced at their international rates, they were pretty comparable. 
		
	
		
		
		
		
		
	
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