the symbol of lock surrounded by arrow?
aslo when i take a pic and come to zoom it ,,it just zoom one time at the firsst double click and when i come with 2 fingers to zoom in more it return quickly to its original size>>!!!!???
That lock with the arrow around it (
)is to stop the screen from rotating. See this Apple doc for more info -> iPhone and iPod touch: Screen does not rotate
For the zoom problem, you may need to take a look at the accessibility settings on your iPhone.