You will need to request this interest rate change in NetBank Settings > Product Requests > Switch account options, select Netbank Saver account and then click Go.
Total Interest rate will be 4.00% (Standard Variable Rate 1.65% + 3 month special offer 2.4%).
Type Compare & Switch on the search bar in the app. Select compare and switch account. Enter your pin and it will direct you to the Comm bank website.
Friends don't let friends use a CommBank savings account. https://www.ozbargain.com.au/node/760126