I know that everyone is probably tired of the "best rom" thread which keeps on popping up everyday and I don't really think that snubbing them off is the correct thing to do. Most of people who ask such questions are probably new to the forums or ...
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Maybe try mailing your service provider. It wasn't working for me too and I mailed mine and they activated it from the backend.
Not working on oneplus one.
Sent from my One+ using Tapatalk 2
When this happens, go to wifi settings, press left soft-key and click on "Scan".
It will start connecting now. I use this as a workaround.