Activate eSim after purchasing a plan through the Prepaid eSim app

gramps28 wrote:

A Tmobile sim can only be activated on Tmobile towers so once you get off the plane you will be able to activate it.

Thanks for your reply, however, how can I activate it  once I get off the plane ? the esim is not added yet to my iPhone settings because I chose not to activate at time of purchase through the app.