Add up your data requirements.
Decide what can be done with a throttle connection--and what can not.
In my own situation, my only wobbly wide web access is via cell phone(s).
I have two phones--both with "unlimited" data. I use the one with the least amount of "data" on it first. Then I use it throttled. When I find something that won't work on the "throttled" connection, then I switch to the other phone.
I can do netflix or zoom when throttled (0.57 megs, latency 54 ms unloaded, 1.5 seconds loaded, upload .93 megs, just measured with fast.com).
For netflix it may take a few seconds to start the stream (~30 seconds, just now)
There are devices that can be plugged into the obd port to provide internet access, such as the Mobley. They work if the ignition is turned on, and there are ways to power them without the ignition being on. Of course, there is a monthly charge to use them. For a time--they were sold with "unlimited" data. I do not know if that is the case any more.
This link is just to show you the device.
https://www.amazon.ca/ZTE-VM6200-Mobley-Mobile-Hotspot/dp/B0728FLZHDThis link is to AT&T
https://www.att.com/plans/connected-car.html