You can go to http://gs.tarkington.isd.esc4.net/txConnectMobile on your device. Use the same login and password information. You also create a new user. This is a Beta version and it is still being tested.
If you have not checked grades lately, please set up a new account. You will use your old portal ID (not the student ID). If you have any question, please contact me at 281-592-6885 or firstname.lastname@example.org.