ok. here is the story, my old trusty 1st gen iphone 4gb got extremely hot and a phone call later i got a brand new replacement from apple under applecare. Now i am gonna sell it on ebay, as i just picked up a iphone 3G today. So should i or do i need to activate it ? like put in my old sim card and connect thru itunes? and second question is should i unlock it? or just leave it as is and sell it? thanks in advance guys!!