If you face some difficulty with your NOKIA LUMIA 900 AT&T such it is very slow or it is hanging and NOKIA LUMIA 900 AT&T shows any unexpected behavior.If there is a problem with any installed application such installed application is not work or is not supported by NOKIA LUMIA 900 AT&T and which you cannot uninstall. When NOKIA LUMIA 900 AT&T is not working properly or not responding quickly you may have to reset it. It is advisable to execute soft reset first and if soft reset could not solve your problem then you need to hard reset. Many cell phone company gives user the opportunity to hard reset their mobile by may way and many mobile