My dad just got his first iPhone 2 days ago. In order to check his office voicemail from somewhere other than his office, he must: Call a certain number. Wait to hear a voice. Press "**" Wait for a voice. Press "(his extension)(4 digit code)##" Listen to voicemail. However, since using the iPhone, the voice doesn't sound after pressing "**". If he uses any other phone, it works. Any help? He sees this as a big problem.