3 months is the standard notice time for a developer (and for most qualified jobs) in France. This is written in your contract when you get a job. This is both ways: when you leave or when you are fired.
So leaving without notice time (or with a shorter time) is something you have to negociate.
Now that is perfectly fine. The standard of professionalism applies equally to bother employer and employee. I have absolutely no problem with that.
Apple sets its price points based on flash storage amount. If people can easily add more storage, that will be a win for the consumer. Yay, competition!
The win is purely empirical because you still need to use SanDisk's App to move files between your iPhone and the SanDisk unit. It does not completely integrate with the iOS platform. It would be a real win if you could actively use the SanDisk unit for storage. Really, the iPhone is a very consumer unfriendly device. I drink the Apple Kool Aid as far as my MacBook Pro is concerned. For my choice of smartphone, I am Android all of the way. I don't believe in spending more than 150.00 for a smartphone. At the prices of the flagship phones, I'd rather have a better tablet or spend my money elsewhere.
Beware of the Turing Tar-pit in which everything is possible but nothing of interest is easy.