Sorry to say but the Note 8 is too old to get Android 11, Android 9 is the last update it would received
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Samsung has the best update package in the industry as is. There's a lot of things out of their control because they don't make all the components, for instance snapdragon chips lose support from Qualcomm after a certain amount of time, but 4 years or updates and 5 years of security is actually pushing it, believe it or not
I traded in my Note 10 plus for the z-fold 4 almost a year ago. I kept an older S8 Plus with a cracked screen. I have used it twice while my z-fold was in the shop for the protective screen cover replacement and had no problem calling or texting. I would question your carriers reason for not being able to use your phone. You should realize you would be doing so at your own risk.
