On your Android, install Cisco Jabber. (Alternatively, you can tap Play Store on your device and then search for Cisco Jabber.

Tap Install. 

If you are on a Schreiner owned and managed device, please reach out to the helpdesk to get your copy installed, or check the Company Portal app for availability.

Tap Accept to allow Jabber to access the features listed.

Read the notices and license terms and tap Accept. 

Sign into the app with your @schreiner.edu email and password.

From here you will now have access to the phone number you had while on Schreiner University's campus.  Please note the Android application only has your main line. It does not work for multi-line setups.