When you’re away from your iPhone, you can check your voicemail from another phone by calling your voicemail number. Your voicemail number is the same as your phone number, but with a “1” added to the beginning. For example, if your phone number is 555-123-4567, your voicemail number would be 555-123-4567.
To check your voicemail from another phone, simply dial your voicemail number and follow the prompts. You will be asked to enter your voicemail password. Once you have entered your password, you will be able to listen to your voicemail messages.