If you have iPhone XS or above, you can have eSIM activated in your iPhone. When you get a new iPhone, Apple have a feature called "Quick transfer" when you can do a quick eSIM to eSIM transfer between the phone.
Example:
1. You have iPhone XS Max with eSIM
2. You get a new iPhone (12 Pro or 13 Pro) either from Apple or Verizon
3. You can transfer the eSIM from iPhone XS Max to iPhone 13 Pro during the phone setup.
HOWEVER, Verizon does NOT support this quick transfer (T-Mobile and AT&T do) and searching this forum, there seems to be a LOT of difficulties doing eSIM transfer.
So as of September 2021, can anyone provide insight how to do eSIM transfer? I am getting iPhone 13 Pro soon and I need to activate it with eSIM. I currently have iPhone XS Max with eSIM and Verizon service.