Hi there! I see you're having trouble getting both the Just eSIM app and your eSIM itself to work on your iPhone. Let’s get to the bottom of this together.

To start, could you tell me a bit more about what exactly is happening? For example:
- Are you unable to open the app, or does it crash or show an error?
- Is the eSIM not activating, or is it active but not connecting to the network?
- Have you already tried any troubleshooting like restarting the phone or reinstalling the app?

Meanwhile, here is a simple step-by-step to try out that often helps with most eSIM problems on your iPhone running iOS 26_1_0:

1. Check Device Compatibility
Ensure your iPhone model supports eSIM technology, which most recent models do.

2. Restart Your iPhone
Turn it off completely, wait 30 seconds, and turn it on again. This refreshes the system and can solve minor glitches.

3. Check Cellular Settings
Go to Settings > Cellular and see if the eSIM profile is showing under your cellular plans. If it is, try turning it off and on again.

4. Update iOS if Needed
Make sure your phone is running the latest iOS version, as updates can improve eSIM functionality.

5. Reinstall the App
Delete the Just eSIM app and reinstall it fresh from the App Store.

6. Check Network and Activation
Are you connected to stable Wi-Fi or cellular data when activating the eSIM? Sometimes activation needs a solid network connection.

If after these steps the app still won’t launch or the eSIM won’t activate, the problem may be with your eSIM profile installation or your network provider’s activation server.

Please try these initial steps and share with me what happens. If necessary, I can guide you through more advanced troubleshooting or contacting support with our backend insights to get your connection up and running.

How does that sound?