As someone on Reddit pointed out make sure to disconnect your number from iMessage and Facetime before switching over the sim.
Regarding the anxiety, I am part of a community that has dumbphones and when flying or the like there are alternatives to using your phone as an e-ticket. Also, people seem to be respectful about the fact that we have dumbphones as apposed to giving us attitude.
As someone on Reddit pointed out make sure to disconnect your number from iMessage and Facetime before switching over the sim.
Regarding the anxiety, I am part of a community that has dumbphones and when flying or the like there are alternatives to using your phone as an e-ticket. Also, people seem to be respectful about the fact that we have dumbphones as apposed to giving us attitude.
Best of luck!