why iphone dont want stay open

Hello djthug4000,

You may need to adjust the amount of time before your iPhone locks itself in Settings -> General -> Auto-Lock.

Auto-Lock

Locking iPhone turns off the display. Nothing happens if you touch the screen. You can still receive calls and text messages, an you can adjust the volume and use the mic button on the iPhone Stereo headset when listening to music or on a call.

Set the amount of time before iPhone locks

Choose General > Auto-Lock and choose a time.

iPhone: About General Settings

http://support.apple.com/kb/TA38641

Cheers,

Allen