Hi tolga
I would challenge the above assumption. Mobile applications really should be made from the get go with accessibility in mind. If your developers are using stock ui kits, it shouldn’t be that hard.
If that’s not doable, there are other identifiers (although not as powerful as Id) such as:
iOS ui automation
Ui Automator (android)
xpath
Text and text_exact methods for finding elements by text value.
There’s tons of examples here on this board as well as the sauce labs appium boot camp
Good luck!