

I’d say very slim.
First, GrapheneOS insist on specific hardware which means Fairphone would have to make very specific changes to the device for GrapeheneOS to be supported. This would make the phone more expensive, which is a huge problem for Fairphone: Building a high-quality repairable smartphone with more ethically sourced minerals at a reasonable price is hard enough already.
Second, the team behind GrapheneOS are not exactly masters of diplomacy. I’ve seen them trash Fairphone on multiple occasions, either for association with /e/OS which they seem to think is the product of Satan himself (just like all other phone operative systems other than iOS, stock Android, and GrapheneOS), or because Fairphone supports devices for too long and that this has bad security implications or whatever. They seem to have some sort of specific beef with Fairphone, and I very much doubt either party would be interested in cooperating as a result.






Fairphones with /e/OS is shipped by Murena, a French company who just cooperates with Fairphone. For GrapheneOS to ship on Fairphones Graphene would have to make a similar arrangement. They won’t, for a number of reasons.