It's completely and utterly messed up my iPhone 6s. Whatsapp no longer works, well I can get into it but it just hangs. Then iMessage and FaceTime do not work, when I go into the settings it just hangs on either messages or FaceTime. Meaning I cannot get into them to change the settings.
My phone always does a backup so when I did my update, the phone was backed up.
Not sure what to do now, I've restarted the phone a few times but still gives me the same issues.
I've never ever had an issue updating other non apple phones. But every damn time I have no end of issues with IPhones when updating.