The iPhone has a special way of delivering voicemail to the handset. To implement this its going to need some backend services to call on that are integrated with the voicemail provider. So it seems quite reasonable that some features of the iPhone will not work if you just pop in a SIM card from a random GSM operator.
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The iPhone has a special way of delivering voicemail to the handset. To implement this its going to need some backend services to call on that are integrated with the voicemail provider. So it seems quite reasonable that some features of the iPhone will not work if you just pop in a SIM card from a random GSM operator.