I've recently purchased an Ideos U8150, running 2.2 (I think). It's shiny and I like it! The problem is that it used to ring just fine when I got it, but lately all calls have been going straight to voicemail (using 2Degrees in New Zealand). I am getting a notification that I missed the call, however. Is this more likely to be a problem with my phone, carrier, network, phone settings or location? Thanks.