How will initiating a phone call through the same interface as writing an e-mail solve these problems?
You phone somebody and don't leave a message, so they get an empty voicemail. How can the interface on your device possibly solve that problem? (By the way, I have a $30 answering machine at home that's smart enough to not record empty messages, and for day-to-day use its interface is a button for "play" and a button for "delete". The interface is not the problem.)
Then you send an SMS and immediately turn around and send an e-mail as well. How will a user interface prevent the person from getting both the message and the e-mail?
You phone somebody and don't leave a message, so they get an empty voicemail. How can the interface on your device possibly solve that problem? (By the way, I have a $30 answering machine at home that's smart enough to not record empty messages, and for day-to-day use its interface is a button for "play" and a button for "delete". The interface is not the problem.)
Then you send an SMS and immediately turn around and send an e-mail as well. How will a user interface prevent the person from getting both the message and the e-mail?