Yes, at your destination you should turn your eSimmer eSim data roaming ON. Data roaming lets your phone use the internet and mobile data while travelling. To check your data roaming settings, follow these steps:
Go to your phone Settings > Mobile
Ensure your eSimmer eSIM is ON, with Data Roaming ON.
If your home SIM is active, turn OFF Data Roaming.
Your eSimmer eSIM will automatically activate to the assigned overseas network.