I am having wi-fi issues with my iphone 4. It takes forever to connect to wi-fi and when it does but as soon as I switch to use the internet or check email from settings it switches back to 3g. The wi-fi signal is still strong on other devices and shows a strong signal under networks available on my phone. I treid resetting the network settings but this did not solve the problem. Any suggestions? This has happened at numerous places with free wi-fi that I have visited in the past 4 days. I only have the 200 mb plan from ATT so I try to use wi-fi whenever possible.