@jnm I'm a bit late in the discussion but what I can say is that I have the exact same problem. I also use a sim from Free Mobile. Here are additional information : When data stops working, flip airplane mode ON then OFF. You get data again for some (undefined) time. With some combination of WIFI ON / WIFI OFF / DATA OFF / DATA ON / AIRPLANE MODE ON / AIRPLANE MODE OFF, at some point, I get a stable data connection. I have not found the gold sequence. Maybe timings are of importance here. Once data is stable, I can switch data OFF then ON without any problem... Until I activate WIFI. Then the problem rise again. Or maybe I'm completely wrong. Maybe data works when the network used is from another operator (roaming). Is there a way to know which operator is really used in UBports ? My feeling is that this is a software issue, not an operator issue. My feeling is the connection is established but the system says it is not. Again, I can be completely wrong. @jnm, you said there were no problem before end of 2023. Free has activated VoLTE and VoWIFI on their network at that time. Maybe this is the source of the issue...