After my last update on iphone 5, I am no longer able to turn my phone horizontally and have the picture turn as well. What's up?

Hi, hoopsnut34.

Thank you for visiting Apple Support Communities.

The most common cause for the screen not rotating would be the Screen Rotation Lock button is enabled. Here are the steps on how to disable this feature.

iOS: Screen does not rotate

http://support.apple.com/kb/ts3805

Here are the steps on how to send a group text message.

iOS: Understanding group messaging

http://support.apple.com/kb/HT5760

Cheers,

Jason H.