Q: my iphone is hanged? what should i do?

from the tree

please expalin

It would help if you provided more information. What were you doing when the problem arose? What have you tried to correct the problem? What, if any, error messages did you receive?

Reset your device: hold down the home button along with the sleep/wake button until the screen goes black and you see the Apple, then let go. (No data loss)