Facelock can and does work on an NS4G, just not very well due to the VGA front camera. I added it on to my phone and when the lighting was right it worked great. After about a day, it started annoying me, as half the time it did not recognize and i had to enter a code each time. It will work, but not always which is why we wont get it. It is easy to add, but IMO not worth the trouble.