Even with background app refresh shut off for photos, if cellular data is enabled and it tried syncing photos from itself or other devices when you open the app, it's going to start transferring data. Try shutting off cellular data, which will restrict photos to wifi only. Settings > Photos > Cellular Data If iCloud photos is enabled that can also eat a lot of data if you take a lot of photos.
Also, Telus usually sends notifications when you reach a certain % of your data as well. Did you not receive any of them? I usually get an SMS message when I hit 90% of my data and another at 100%. It'll also block data at $50 over unless you specifically unblock it. See: https://www.telus.com/en/bc/support/article/mobility-data-usage-notifications
Data notifications keep you informed of data usage on your account so you can adjust your usage and avoid unexpected data charges. Notifications are sent for data included in your plan as well as any additional data charges including pay-per-use usage and data top-ups if the data included in your plan is ever exceeded.
Whether you use a feature phone, smartphone, tablet or a mobile Internet key, we will notify you when you're close to using all of the data included in your monthly rate plan or data top-up.
By default we send these notifications by SMS text message but you can choose between email and/or SMS as your preferred contact method by logging into , selecting Usage and using the Data manager option.
These are the settings I have on my Telus account:
If your devices are transferring too much data, switching providers won't help. Double check the settings and configuration on your devices. I've shut off cellular data for most apps on my iPhone. Some games with video ads in them can eat up bandwidth pretty fast and some apps just don't need cellular data access. Settings > Cellular > (scroll down)
Additionally one other key setting that needs to be disabled is called Wi-Fi Assist. It's at the very bottom of the Cellular page. If you have weak wifi, Apple enables Wi-Fi Assist by default which uses cellular if the wifi is too weak.
I know none of these suggestions can fix the billing issue but they may help prevent future data usage issues.
Unlimited plans are at a very slow speed once the user has gone beyond their base quantity of data. So slow, in fact, that many consider it unusable. Don’t get caught up on the idea that unlimited data is some sort of panacea.
Also note that ‘unlimited plans’ only became available this week on anyone other than Freedom mobile.
for what?! NOTHING. Air!! I agree that data charges are too high, but at the same time, you need to set things up so you don't receive an unexpected bill - by configuring your phone to work within your plan.
Exclaiming that it is "only iPhone pictures) and "for what?! NOTHING. Air!! " is nonsense. Photos can be several megabytes each, depending upon your settings. I have over 16,000 photos in my library, and I use very little data. And claiming that "air" is nothing, obviously you missed the part about the mobile companies having to pay billions for spectrum, which is, essentially "air", so yes, it does cost them something.
The other issue is how all these mobile towers connect to the internet, which is via a large multibillion dollar fiber optic network. Then, that all has to be connected to the internet.
"unlimited" plans are not unlimited. Learn from this, configure your equipment and notifications, and live within your data plan. We all have to do that. Switching carriers will do nothing for you.