I think countdown has begun apple's days...... Not seen such a inferior update in any of the OS. "ZERO" innovation...Battery is draining very badly & my phone has become very very slow.
IOS 8 operates only on 3G or LTE or WiFi and there is no option to operate it on 2G. As a consequent it is a big drain on battery and requires re-charging every 2-3 hours. Another option is to switch on 3G or LTE when needed else is to kept off, as a result all the features of IOS 8 are not usable/available on I phone versions older than I Phone 6 or 6 plus.