Comment by 0x0

If you create a custom SSL CA, you can add that CA to your ios devices and simulators, and they will trust your backend served with an SSL certificate issued by your custom CA, no app modifications needed. (On modern Android, this does not work out of the box - it requires the custom SSL CA fingerprints to be added to a network configuration file embedded in the app - but you could always use gradle flavors and only add it to your debug/development builds)