I frequently use the GPS apps on my Samsung intercept and found that I cannot get a GPS signal sometimes. Even restarting the phone doesn't work.. the GPS will get a signal for maybe for a minute before it stops working again. When my GPS stops, I go into the "GPS Test" app and it says 0 satellites visible. I don't know if it's a coincidence but it seems to happen more often in the afternoon when my phone's battery is slightly below 50% capacity. The GPS simply refuses to work consistently.