How to Change the APN settings on iOS.

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Go to settings and scroll a short way down to Mobile Service or Mobile settings. Should be a green icon with a radio antenna graphic.

Select it.

Scroll down to SIMs and select the eSIM that you have just installed. It may be called anything but it's usually the one underneath your Domestic or Primary SIM.

Once you have selected Mobile Data or Mobile data network, you will see a screen for APN settings.  Make sure this is set exactly as your vendor provided. They are case sensitive. > EXIT Back to Home

• Go to Settings > Connections > SIM manager

Under 'Mobile data', check that your preferred eSIM (in this case, your travel eSIM) has been selected as the eSIM that you want to use data from.

Check that 'Data switching' has been turned off, so that your phone does not automatically switch to the other SIM card for data.