Several users are getting the “com.apple.mobilephone error 1035” error on their visual voicemail whenever they try updating or setting up their visual voicemail greetings. Visual voicemail lets you view your voicemail message that you receive. Voicemail greeting is the message that callers will hear before they are offered the opportunity to leave you a message. However, this error will prevent users from setting up their greetings. The full error message will be “The operation couldn’t be completed (com.apple.mobilephone error 1035)“.
If you’ve already created a custom voicemail on your iPhone, you can tap Play to see how your voicemail sounds. If you’re interested in creating a new message, tap the Custom button. From here, you can start recording your message by tapping Record and tapping Stop whenever you’re finished. Once you’re finished recording, tap on Play to make sure the message comes across as you’d like and hit Save (in the upper right) to save it as your voicemail.

On the "Voicemail greeting" tab, click on the "Record a greeting" button to record the voicemail greetings. A voicemail's time is approximately is around 10 seconds, wait for it to finish. Once done recording, click on the "Stop" button at the center of the recording tab to end it.
To locate your Voice Recordings in the My Files app please follow the below steps; Launch the My Files app Under categories select Audio Select Voice Recorder Convert Speech to Text Click to Expand 7 Your speech will then be converted to text. Once complete tap on and save the file. Sharing Voice Recordings Click to Expand 3 If you would like to share multiple voice recordings select accordingly then tap on Share Continue Recording on Existing Voice Recording Click to Expand 1 Select the exsiting Voice Recording you would like to continue Recording 8 Once saved you will be able to view the new recording at the top of your list