Does anyone happen to know the shortcut to go back on the physical keyboard? My touch screen has stopped working entirely. I can navigate with the keyboard, but I am not sure what the back button is. I have done a few searches, but I haven't found anything. Sprint has 0 parts to fix my phone and a reconditioned phone will take 7-10 days to get here. So I am out of luck for a phone. Thanks for your help.