No internet connection

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Level 1c
I have received sms to say my NBN service is awaiting activation and i am required to connect my modem. so i connected the modem to phone line available . The instructions tell me i have to get lights on the on modem but i got a no internet or Adsl light on the Wi-Fi modem . Can someone tell me, who needs to activate NBN? Is it something i have to do or wait for TPG?