Once unlocked it can be used just like any other GSM phone, except that they are configured to not connect to the US GSM network code, 310. Bottom line - they will not connect to a USA GSM network. 
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					Originally Posted by  rfranzq
					 
				 
				So, once unlocked can it be used in the US??   
 The four GSM bands [or just the non US ones]?  And what other bands? 
			
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				Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,   
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile