Hi, I purchased a 3g on October 2008 with Applecare warranty for the second year. My battery life has really plummeted(lasts about 3-5 hours if I am using it wihotu music/video), I have dropped calls all the time, and the device is running really slow on firmware 3.1.2. I checked the AT&T site and they state I will be elegible for a "subsidized" upgrade to a new phone in March 2010. I know a new(4g?) phone might come out in June-July 2010. However, I am really frustrated with the phone battery and speed. What is likely to happen if I take the 3g to Apple for replacement under Apple care? Will they replace it with new 3g(or 3gs) or make me wait a week for a replacement? If I get the 3g replaced with 3g/3gs will this make me ineligible for the 4g "subsidized" upgrade? Will I have to pay full price to get the 4g if I use apple care to replace the 3g? Thanks.