PetroCan Mobility (Good2Go mobile) APN

Caution: PetroCan Mobility (now rebranded  as good2go mobile) prepaid cellular data is ultra expensive, $0.15 per MB ($150 per GB).
Only enable cellular data when you occasionally need to use data, turn it off when done.
or buy online an eSIM from trip.com  Canada/USA eSIM is 70 times cheaper than good2go's

To turn off cellular data:
Settings...Cellular...Cellular Data (ON or OFF)

You must install a proper APN Profile.   APN is ltedata.apn
You can follow the instruction on https://good2gomobile.ca/
click Support.. Data Settings

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(PetroCan uses Rogers Wireless network).

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Another method:
Open iPhone's Safari web browser.
https://ogne.tech/apns/generator/
In the APN field, enter rogers-core-appl1.apn
[note spelling: appl as in apple without e, followed by a number 1]
Tap INSTALL button. After APN profile is downloaded.
Close Safari. Go to iPhone Settings...
You will see an item like "Profile Downloaded". Tap on it and choose "APN Ogne Tech"
Tap "install" and follow the on screen prompts.
A few steps later, the proper APN profile is installed.