Yes i have tried them twice but didnt fix.

There isnt any problem with having iMessages, and i like it. But Problem is iMesssage doesnt want me to send SMS at all, no matter if i switch off the internet connection. It was not like that on iOS 7.1.2 (i am also a bit regretful that i have updated my iPhone) I can force it to send sms by...

Because i dont have always WiFi. Plus if the opposite person is offline and there is an emergency, would like send SMS instead. And people who i know dont have iPhone all of them. Therefor i need to send sms to them.

Since updated from iOS 7.1.2 i am unable to send SMS to people who have iMessage. While wifi and mobile data is off still iMessage keeps being blue. On iOS 7.1.2 it was enough to switch off internet connection to send SMS. BUT this can also happen on iOS 8.3, only if i switch on "Send as SMS"...

I bought my iPhone 4s last year February and on iOS 8.3 my battery life lasts between 3-3.5 hours.