My work iPhone was recently switched from O2 to Vodafone. Initially I didn’t notice too much difference, true tethering has been useful now and again. However one big difference has come up that is slightly annoying. It would appear on Vodafone you don’t get visual voicemail as you do with O2. As a result if you get voicemail you need to dial 121 to see who has left you a message and how many messages you have.
I believe that the only way that this can be fixed is at carrier level and if the “complaints” on the Vodafone forums are anything to go by then Vodafone aren’t in any hurry to add this feature.
Is this a critical flaw? No but it an annoying one!