How can I simulate "no internet connection"?

Hi, I am doing webrequests from my watch face and would like to test/simulate cases when the Bluetooth connection to the phone is good but the phone does not have an Internet connection (e.g. out of mobile data coverage). In the simulator I can simlate the BT connection up and down but have not found a setting for switching mobile data on or off. I guess I could try to disconnect my computer from the Internet, but thought it could be other and easier ways to do it. Thanks in advance!