How to set up eSIM on iPhone? Setting up an eSIM on your iPhone is quick and easy. Follow these steps: When the Cellular Plan Detected notification appears, tap it. Tap Continue at the bottom of the screen. Tap Add Cellular Plan. Label your new plan (e.g., “Travel” or “Nomad Data”). In your Cellular Data settings, ensure the new plan is selected and Allow Cellular Data Switching is turned OFF to avoid roaming charges.