Is this a new account activation? Check your PM self-serve account to see that your account is active and the plan is what it should be (includes talk).
Also, try turning off your phone, remove the SIM for a minute and replace it, then reboot.
If that doesn't work or if there is anything off with your account, then you'll need a moderator to help.
Click this Moderator_Team link to private message for assistance.
More info on moderators: http://productioncommunity.publicmobile.ca/t5/Knowledge-Base/Updated-Contacting-our-Community-Modera...
Include your PM SIM card number, e-mail address and phone number.
