So rather than guess I just finished a live chat with Samsung. They confirmed with me this is still a present "feature" (not even sure you'd call it that) with the S8. Now, it could be a Canada exclusive feature but whenever a new SIM is introduced into the phone it will auto factory reset. I can't imagine how mad I'd be if I was a traveller for business and had to swap SIM's often. Samsung should really consider having this as an optional "feature".
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Chat InformationYou are now chatting with 'Ashley'. There will be a brief survey at the end of our chat to share feedback on my performance today.
Chat InformationYour Issue ID for this chat is LTK111730376726X
Ashley: Hi, thank you for contacting Samsung Canada support. How may I assist you today?
Lundon: Hi, I'd like to confirm if a specific feature is included in my Galaxy S8+
Ashley: Hello Lundon. Please go ahead with your question.
Lundon: There was a feature introduced only on the Canadian version on the Galaxy Note 7
Lundon: The feature was the phone would factory reset when swapping the SIM card to a new SIM card
Lundon: Apparently the carriers didnt know it existed, and it wasnt in the manual
Lundon: This was ONLY introduced as of the Note 7
Lundon: Can you confirm if this "feature" is still present in the new Galaxy S8's?
Lundon: I'm switching to a new carrier and I would be very upset if they phone does a factory reset.
Ashley: I would like to inform you that, some times the phone reset automatically after SIM is inserted, please take the data back up and remove your Samsung and google accounts from phone and then change the SIM.
Lundon: You say sometimes. What are the times it does not?
Ashley: I am sorry for the above statement, the phone will reset automatically whenever the SIM is changed, and it's recommended to take back up before changing the SIM.
Lundon: So if I was travelling, and changed SIM's often, the phone would reset every time and I would all my data? Is there any way to avoid this?
Ashley: I am sorry Lundon, it can't be avoided.
So I guess my only question now is, how can I back up literally everything to copy it back after the phone gets needlessly wiped? Smart Switch is useful.. But can't carry over custom notifications, alerts, contact photos, logins etc.