My iphone 5 doesn't create a Wi-Fi network so I can share internet with other devices?

Whenever i activate internet sharing through Wi-Fi and I select Wi-Fi and bluetooth my iphone starts bluetooth but doesn't create the Wi-Fi network and no Wi-Fi symbol is shown on screen.
I can't see my network in other devices.
I did this before and worked but no since a month ago. I tried to restart network settings but no success. Iphone 5 ios 7

Your Carrier plan probably doesn't support Internet tethering. You should call your Carrier's customer service for help.

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