1. You ll be fine.Every phone charger has the same voltage output.Voltage is the only thing you should considere if you want to exchange charger use.
2. Look at apple website http://www.apple.com/support/products/iphone.html
it give you TWO years of apple care counted from the date you purchased your iphone NOT your extended apple care.
2. Look at apple website http://www.apple.com/support/products/iphone.html
it give you TWO years of apple care counted from the date you purchased your iphone NOT your extended apple care.