How do I get rid of MM Phone notification. Emergency calls only?

I've had my Samsyng Galaxy S8+ for about over half a year. I moved to a new place so the network is very bad and I don't have Wi-Fi. So I was messing around with my Network Mode settings which was originally set to LTE/3G/2G (auto connect) so I changed it to 2G only, then 3G only, then 2G/3G only then finally back to LTE/3G/2G (auto connect). When I did that I got the notification and it's not been working. It's been about 20 minutes.

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