I purchased a Phoenix eSIM because it covers a number of countries we plan to visit in coming months. I activated it in Canada and everything worked great. In Vietnam, however, it not work at all. Keepgo support was great about giving me advice to change a few eSIM settings and my iPhone 14 Pro was finally able to connect. However, connection to the Data network was always unstable and disconnected within minutes, This occurred in Hanoi and Ho Chi Minh City. My wife has the same eSIM and had the same issues. In the end, we were forced to purchase Airalo eSIMs for Vietnam and they worked perfectly! In contrast, our friend used the Keepgo Andromeda eSIM and had no issues in Vietnam (that eSIM uses different telcos in Vietnam).
This was all very disappointing and makes us wonder what other issues might exist if we use Phoenix for other countries.
I should also point out that we found the Phoenix eSIM to work very well in Cambodia. So whatever the issue was, it was specific to Vietnam support.