My kids gave me a used iphone 4s. I was using it without data, just for calling and texting, but a couple of days ago I added a month's worth of data just for while I'm on vacation. I can't seem to get it to work. I've gone to settings and I've got Cellular Data turned on. I've tried what it says on the Telus website -- plug it into itunes. And it says it needs an update but the phone itself won't do the IOS 9.2.1. update. What else should I do?
You will need to connect to wifi to update to 9.2.1, it can't be done over the cellular network.
Confirm with Telus that there is not a data block placed on the account to prevent data consumption.
You may need to go to Settings > cellular and turn on data for each app.
I'll see if I can add any more info in the morning. Edit - the above pretty much covers it.