@JudyD
Since you are having issues activating with the app there is an online live chat specifically for new customers having difficulty activating which you might be interested in trying out:
https://services.telus.com/chat/publicmobile/chat-pm.html?portal=publicmobile&language=en
EDIT:
Just realizing from a previous post of yours that you aren’t a new customer. If you are only trying to attach a new SIM card to your existing account you can do so by logging into your account on a desktop computer (Mobile has issues with this process), going to the profile tab, scrolling down to “My number” and you’ll see a SIM card number with a pencil icon beside it, you can click the pencil and put in your new SIM card number. This will deactivate your old SIM card and switch to the new one.
You can also click this link to go right there:
https://myaccount.publicmobile.ca/en/account/profile/change-sim-number
