For a while now, my wi-fi for my samsung galaxy s4 has been weird. My house has a secured Wi-Fi network, so anytime i'm at home, the wi-fi is completely fine. So whenever I leave my house like when i'm going out or whatever, my phone automatically goes to AT&T's 4G LTE Wi-Fi everytime. Lets say if theres a Optimum wi fi around and I try to connect to it, it only works for like 2 mins or so and then it kicks me out and goes back to AT&T's wi fi. Another example would be if im in school, and I try to use the school's wi-fi, it only works for a few minutes and then once again, kicks me right out and forces me to use the 4G LTE. So what I did was go I went into Settings>More Networks>Mobile Networks, and then I turned off the mobile data option. This fixed everything I was having a problem with before. I now don't get kicked out of other wi-fi networks, whenever i'm out I can connect to other wi-fi's, etc. However, the NEW problem is that I can't send pictures, use the internet, can't accept text messages with pictures, etc. How can I fix this whole problem so that my phone can automatically stop using AT&T's Wi-Fi everytime I go out, and I can still use the mobile data? Please help, this is so frustrating i'm going insane haha thank you 

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