Does Hello Epics work in the Trello mobile apps?

Yes, Hello Epics works with the Trello Mobile apps in a limited way. You can see all of a parent card's children when looking at the parent card. They will appear as Trello Card attachments. There is currently no way to see a child's parent from the child card.

If you'd like to be able to add a child to a parent card, you must first enable "Treat attached cards as children" in your Hello Epics Board Settings on that board:

Then:

1. Open the child card in the mobile app.
2. Tap the dots in the top right.
3. Tap "Copy Link".
4. Open the parent card.
5. Tap "Add attachment".
6. Tap "Attach Copied Link"

For full Hello Epics functionality, you can use Trello in phone's web browser.