With this method, you don’t need a third-party app. Call the person you want to chat with, then tap the “Add Call” button on your phone’s screen. Dial your own phone number—the one you’re calling from. This will take you to your voicemail. Once your voicemail has started recording, tap the “Merge Calls” button on your screen. Now, you’ll record your phone conversation onto a voicemail message. When you’re done with the call, you can tap the share button to export it to your Mac via Airdrop, to the Voice Memos app, or transfer it via email or text message. The file is recorded as an M4A, so depending on what you want to do with it, you may need to convert it to MP3 before uploading it to other apps.
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)“.

Hi, you have reached …. Please leave your name, phone number and a message and if we like it we will return your call.
-(Very long pause) Wait! Please don’t hang up! I want to hear what you have to say.