A system and a method are disclosed for sharing contact information between two mobile phones. A user of a first mobile phone can select contact information stored in the mobile phone to be shared with a second mobile phone while having live phone call with a caller of the second mobile phone. The first mobile phone transmits the contact information to the second mobile phone using a voice channel of the phone call while the phone call is established. For example, the first mobile phone may convert the contact information into an audio signal and send the audio signal to the second mobile phone while the phone call is established. The second mobile phone receives the contact information and provides a user interface such that a caller can call a phone number in the contact information with a single button press.