IPhone 5 Wi-Fi turning off by itself?

I turn on Wi-Fi to prevent getting that annoying throttle in my so called "unlimited" T-Mobile plan. But the problem is that it keeps turning off when the internet is not being used and it's really annoying having to go back to settings and type the password especially on a on-screen virtual keyboard. I tried airplane mode but the problem still persists and I expect important calls and messages. So I can't afford to just keep using airplane mode.

Hold menu button & home button for 10 sec.

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