From Canada and will be going down to Arizona area end of year for 4-5 months. Im looking at a US/Can/Mexico cell/data plan from Telus or Rogers. Can I take a regular nano sim ie. from my cell and use it in the Max BR1 Pro 5G, or does it take a “special” sim? Asking because the Telus representative said a regular sim will work, but I have read different opinions online. Thanks!
I am going to share my experience with the Balance 20x, which may or may not apply to you, but it is a datapoint that leans towards the fact it probably would work.
I was able to take a regular consumer phone SIM from GoogleFi (TMobile) and enable it on the Balance 20x, all I had to do is enter the proper APN info and that was it. Also the 20x had a Micro Sim port if I recall so I had to use an adapter from Nano to Micro. But that was trivial in the end.
Again it may be different with the MAX BR1 Pro 5G and with Telus/Rogers, but there doesn’t seem to be any systematical obstacle using a consumer grade data plan + SIM.
Hope this helps (a bit) 
The short answer:
Maybe it’ll work. Try it, and tell us how it went.
The longer answer:
The experience with deploying a SIM card that has been issued by a carrier as a phone card into a router (or other non-phone) unit varies (at least) by the carrier, the plan, and the device.
Some carriers don’t seem to care about the device regardless of plan, some seem to be rather random (e.g., one US carrier lets you deploy tablet plan SIMs into CAT-12 and 5G routers, but refuses to deploy onto CAT-18 routers (!)), and some seem quite particular (e.g., one US carrier considers Peplink to be “enterprise” equipment, and refuses deployment unless it is on an “enterprise”-branded plan).
Thus, unless you hear from people with your particular carrier plan and device, the answer really is “Maybe… Possibly…”
Cheers,
Z
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Thanks @peparn and @zegor_mjol, guess I will just have to trust the Telus rep then and try a regular sim from Telus! Thanks again! 
And try it locally, in Canada, right now. If it does not work at home, then it is unlikely to work abroad
Cheers,
Z
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