When using your phone:
Insert SIM card > restart your iPhone > follow the Setup Assistant (includes connecting to Wi-Fi network, signing in with or creating a free apple ID, setting up iCloud, turning on recommended features such as Location Services and Find My iPhone, and activating your iPhone with your carrier).
When using a computer:
(Please ensure that you have the latest iTunes is installed on your computer). Connect your iPhone to your computer by using the USB cable that came in the box or a compatible cable. iTunes will start automatically and will prompt you to install an update to the carrier settings. Please click on the “Update Settings”, and iTunes will install data, SMS and Voice services onto your smartphone. After this step is done, navigate to Settings > General > About and ensure that Carrier is listed as “Telus”. If “Telus” isn’t displayed, try to disconnect the USB cable, wait 60 seconds, reconnect it, and repeat the previous steps.
APN Settings:
After inserting SIM Card restart your Smartphone. Go to Settings > Wireless & Networks > Mobile Networks > Access Point Names > Press “MENU” Button > New APN.