How do I open this file on my iPhone?

You don’t.

That file system path is not accessible.

If that was using the Apple Messages app, that attachment might still be downloadable within the Messages app.

Instead of telling us the file name, tell us:

• The app used to receive it
• Your iPhone model
• Your iOS version
• What you did to receive the file
• What you tried to do to open the file
• What you saw
• What worked
• What failed
• Error messages
• Other applicable context

"How do I open this file on my iPhone?: file:///var/mobile/Library/SMS/Attachments/df/15/9133C027-7B10-49EB-8797-0A5E5CD75B63/e3rxkc_7lfdtm 2(3)"

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Got me!

Please provide a screenshot. IMPORTANT: Block out any personal info (i.e. time and names) by covering it with red-colored rectangles and such, through use of the Photos app.