Visual Voicemail missing in some international markets

Interesting article on Telecom TV which discusses the conspicuous absence of Visual Voicemail on international iPhones.

...the feature sits on every iPhone and operators were offered the network-side technology to take advantage of it. But it turns out that the majority of the reported 16 million iPhones sold are now on GSM mobile networks where the operators have been slow to implement, safe in the knowledge that most iPhone users are not even aware their Visual Voicemail is not functioning.