Mobile data is not working on iPhone 15 Pro after recent trip

"It’s been resolved following a call with Apple technician. The problem was I had VPN trying to connect, which was blocking the internet and wifi working. Deleting the VPN resolved the issue immediately. Hope this helps someone else in need."

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Excellent job troubleshooting!

Keep Security Software off of your Apple Devices:

Security Software (i.e. VPNs) just get in the way on an iPhone, and this is a pure example of how and why. So, rid of them, and evade from using them, unless required for school and/or work.

Report this to Apple:

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of you occurrences, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread
4. Proceed from there as necessary

"Mobile data is not working on iPhone 15 Pro after recent trip: My mobile data are not working on iPhone 15Pro since my recent trip to Indonesia. How can it be fixed? [...]called network provider. I have data plans on personal and business number but neither works on the iPhone. This started 10days ago when I was in Bali, Indonesia. Previously it worked well in Singapore and later in Bali for 2 days.[...]"

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So, what did your Carrier say? Seems to be a conciliation of being in a country that does not offer you this service.

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