Hi,
Finally, I managed to solve the MMS issue on my FP4 for french operator "Bouyges Telecom"!
After reading these post: https://forums.ubports.com/topic/10181/fp-4-without-mobile-data/4 and this one https://forums.ubports.com/topic/10464/how-to-fix-mms-issues, I gave it another try and found a working solution for both internet and SMS.

I did:

Delete all existing APN settings Create a new APN setting with fields: Internet and MMS Name: Bouyges Telecom acces: mms.bouygtel.com MMSC: http://mms.bouyguestelecom.fr/mms/wapenc And keep all other fields empty.
Here is the screenshots with french language:
screenshot20241030_205721510.png