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You can deregister/unregister the previously installed app from your old mobile device by using the TouchNet OneCard OneWeb Dashboard. (requires login with your mySUNYOrange credentials)
*** This can also be found in the MySUNY Orange Portal > More App > Click letter "O" > OneCard OneWeb or MySUNY Orange Portal > Student Services Resources Tab (Left Blue Bar White Icons) > Student Resources Section > ID > Manage Virtual ID (OneCard OneWeb)
Click "Manage Campus ID" link as shown below:

After unregistered, you should be able to Log in on the newly installed TouchNet360u APP on your mobile device.