ok not sure I am following you.
in the title you say wifi is not working yet you say you have a IP and it is connected then you say that you see data passed. So what is not working?
When you have wifi on at school can you browse the web?
Were is the data that you see 3G or wifi?
Why do you think that wifi is not working?
are you getting errors?
guess I am saying we need more to go on here. Details man we need details.
If I had to guess
If the small amount of data that you see is in 3G then that may be the phone "signing out" of 3G
If the data is on wifi then it is the phone registering on the network.
but still need more details.
AT&T Samsung Galaxy S4 I337
Samsung Galaxy Tab GT-P7510
A1 Kernel V1.8.8 @ 1.4GHz
I ride with and to end Diabetes won't you please help.