They haven't appeared in many other films besides the Harry Potter franchise. Here are a few:
* The Deathly Hallows: Part 1 & 2 (2010, 2011): They reprise their roles as Fred and George Weasley in the final two installments of the Harry Potter series.
* The Iron Lady (2011): James Phelps has a small, uncredited role as a young man in this biopic about former British Prime Minister Margaret Thatcher.
* Danny and the Human Cannonball (2013): This British comedy saw both James and Oliver Phelps star in supporting roles.
* The Runaways (2015): Oliver Phelps starred in this short film.
* The Escape Room (2019): Both James and Oliver Phelps have starring roles in this thriller.
It's worth noting that they've also appeared in a few TV shows and video games, but primarily, they are known for their roles in the Harry Potter franchise.