thanks @hhaveri
I installed the latest version and so far I notice:
- I could not erase registered cells and had to throw the whole situation and start again (not a big deal)
- I have not anymore the two-cells bug but I started with one cell while I thought it should be from zero
- with flight mode on, the situation was still on
- the situation seems to react as expected when moving but I will test more during the day

edit: I can add that:
- enabling/disabling mobile data does not seem to work; it could be related to the fact that there is something special about having 2 sim slots.