I want to ask about the source code or the operating system of DA9070 product if it's free or when i buy the product ??
I am unsure what you mean by source code. Do you mean the OTP or drivers?
I mean the firmware (main + header file) of the product
All available software and drivers is available here:
An OTP will need to be created with the DA9070 GUI and Eval board.
Do you have everything you need?