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Phone hacking is the practice of intercepting telephone calls or voicemail messages, often by accessing the voicemail messages of a mobile phone without the consent of the phone's owner. The term came to prominence during the News International phone hacking scandal, in which it was alleged (and in some cases proved in court) that the British tabloid newspaper the News of the World had been involved in the interception of voicemail messages of the British Royal Family, other public figures, and the murdered schoolgirl Milly Dowler.
Contrary to what to their name suggests, scandals such as the News International phone hacking scandal have little to do with hacking phones, but rather involve unauthorised remote access to voicemail systems. This is largely possible through weaknesses in the implementations of these systems by telcos.

A simple and effective hack against a pabx system is to attempt to call a direct dial number with voicemail and attempt to enter the voicemail features by entering a weak password while the voicemail initial greeting is being played. If the hacker manages to guess the right password, the pabx may have a "call me back" function. The hacker then selects the call back function, but enters a premium rate number for the call back. The pabx calls back the premium rate line, monetising the attack for the hacker. It is important to turn off the call back feature on the pabx, to use strong passwords. Note that automation techniques will then exploit the hack by constantly calling the compromised voicemail and entering the premium rate number ad-Infinitum.

Since the early days of mobile phone technology, service providers have allowed access to the associated voicemail messages via a landline telephone, requiring the entry of a Personal Identification Number (PIN) to listen to the messages. Many mobile phone companies used a system that set a well-known four digit default PIN that was rarely changed by the phone's owner, making it easy for an adversary who knew both the phone number and the service provider to access the voicemail messages associated with that service. Even where the default PIN was not known, social engineering could be used to reset the voicemail PIN code to the default, by impersonating the owner of the phone during a call to a call centre. Many people also use weak PINs that are easily guessable; to prevent subscribers from choosing PINs with weak password strength, some mobile phone companies now disallow the use of consecutive or repeat digits in voicemail PIN codes.

During the mid-2000s, it was discovered that calls emanating from the handset registered against a voicemail account were put straight through to voicemail without the caller being challenged to enter a PIN. An attacker could therefore use caller ID spoofing to impersonate a victim's handset phone number and thereby gain unauthorized access to the associated voicemail without a PIN.

Following controversies over phone hacking and criticism that was levelled at mobile service providers who allowed access to voicemail without a PIN, many mobile phone companies have strengthened the default security of their systems so that remote access to voicemail messages and other phone settings can no longer be achieved via a default PIN. For example, AT&T announced in August 2011 that all new wireless subscribers would be required to enter a PIN when checking their voicemail, even when checking it from their own phones, while T-Mobile stated that it "recommends that you turn on your voice mail password for added security, but as always, the choice is yours.