If you have installed an eSIM on your iPhone or iPad and cannot connect to data you can try the following troubleshooting steps:
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Make sure your device is disconnected from Wi-Fi network - Sometimes, your device may prioritise Wi-Fi over cellular data, and this can cause issues with eSIM connectivity. If you are not sure what your APN settings should be, contact your eSIM carrier for assistance.
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Reset network settings - You can try resetting your device's network settings by going to Settings > General > Reset > Reset Network Settings. This will reset all your network settings, including your Wi-Fi passwords.
Warning. Make a note of your Wi-Fi passwords. You will need to re-enter them after the reset.
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Update your device software - Make sure your device is running the latest version of iOS or iPadOS. Go to Settings > General > Software Update to check for any available updates.
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Restart your device - Sometimes, simply restarting your device can resolve connectivity issues. Press and hold the power button and either the volume up or down button until you see the slide to power off option. Swipe the slider to turn off your device, then press and hold the power button to turn it back on.