I amusing iphone 6s and now ordered iphone 12 which will arrive in two days time. how to migrate to Iphone 12 and remove iphone 6s data before I handover the old phone iphone 6s to Amazon for trade in.
iPhone 12
Click on this link to learn how to "Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch". Select one of the three options: Quickstart, iCloud, or iTunes/Finder. --> https://support.apple.com/HT201269
Second part of your question:
how to migrate from iphone 6s to iphone 12
