District phone system on your mobile phone ULUSD uses GoTo for our district phone system. To use your mobile device to make/receive calls, check voicemail, and change user settings, please see instructions below. How do I download and install the GoTo app? iOS Watch Video System Requirements: iOS 12.0 / iPad OS 12.0 Download GoTo mobile app for iOS. Select Sign in and then input your ULUSD email address. You may have to set up an account (or use the forgot password option) Use the Sign in with Google option if available. Android Watch Video System Requirements: Android 8.0 or newer. Unauthorised .apk installations via 3rd party stores are not supported. Download GoTo mobile app for Android. Select Sign in and then input your ULUSD email address. You may have to set up an account (or use the forgot password option) Use the Sign in with Google option if available.