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If it was working before in the same location and you are confident nothing has changed on your device or account and you have no data limit set manually, you can remove battery for 45 sec. If that doesn't work best bet is to call tech support.
If it has never worked, and the device is from Telus or fully unlocked then make sure you don't have the data block feature on your accout - online or by calling 611.
Lastly before thinking of factory resetting the device, you can test SIM card in a diff data device to isolate a device/provisioning/network issue ... hope this helps.