Do either of the iPhones have dual SIM? And what are your carriers for both?

If I understand it correctly, the carriers that allow the use of the eSIM will work.

For example if your personal carrier is AT&T and your work is Verizon Wireless. Then you can have both phone numbers on the same phone. Since AT&T locks their phones, and Verizon does not. It would be easier to have VZW use the eSIM on the AT&T phone.

With the merger of T Mobile and Sprint. My girl friend should be able to use just one phone, when everything is settled between the merger.

KOT