I have current is iPhone 3G 16gb that I have AT&T and my home Netgear Router N Wifi. My area does not offer 3G because I live in small town. I have excellent full range WIFI that my iPhone shows. I can see my bars from 1 to 3 bars back and forth that are often searching and then No Service.. It does back and forth on a minute and then off other minute as it is searching the service. I do not understand why my iPhone will not able to use my wifi with out AT&T. it must to use AT&T and why it does require? I have very good signal that is about 500 feet to the tower. my setting is off the Airport Mode, WIFI is on, Enable 3G is off, Data Roaming is off, and VPN is not configured. I am wondering if there any one able to help me to trouble shooting?