I iMore Question Dec 24, 2014 #1 difference between 6.1 and 7.1 on iphone 4 how will upgrading to 7.1 from 6.1 on my iPhone 4 change the phone
difference between 6.1 and 7.1 on iphone 4 how will upgrading to 7.1 from 6.1 on my iPhone 4 change the phone