My Iphone won't stay connected to Wi-Fi

I have an Iphone 4 since october I would try to connect to my Wi-Fi with my 27 lettered and number password then I would lock my screen and it goes back to 3g! Then I would have to type in my password again! Its making me mad! My internet thinging is NETGEAR from cox cables. At my aunts house she has the at&t one and I would step into her house and it would connect all the time at my house I have to retype the password each time. I tried to reset all networks and that didn't work. What should I do?

Did you try saving your password on your device? It usually does it automatically…

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