The touchscreen quit working on my phone last week (Samsung Impression a877). I took it to an AT&T store, but they couldn’t find anything wrong. My contract ends at the end of November, so I can’t get a new phone for cheap yet. Yesterday, I found a Samsung service code that does a full reset of the phone. That fixed the phone. Now that I can operate my phone again, the software version is A877UCID3, and the model is number is SGH-A877. So far, the phone is still working. Hopefully, this fix will work for you. I typed the code using the keyboard and used the keyboard “enter" key when done typing. A screen message came up briefly. It said something about processing and that the phone would shut off and restart. After the restart, the touchscreen was working again. Warning: Entering the following code will erase all data (contacts, text messages etc) from the phone. Back up your phone first, if possible. Code: *2767*3855#