BlockCallsOnWifi

Block call on wifi connect back to google on your Android device
Block call on wifi connect means captive portals wont redirect to login anymore

To do that,

Follow the next steps
Connect your device to your PC and use adb:

There is also a way to change the url it calls:

but disabling probably the easiest.

Here you have a command to test the results.

No PC?

You can give those commands in a terminal app in android (you probably need root parmissions).