Last night when I got home, I saw I had a voicemail. So I did the natural thing and dialed 121. But the phone did not connect. So I tried this a couple of times and thought my phone is broken (it's a Samsung Galaxy S2). I thought the VDC network is down but saw that I have a full signal. I tried another sim in the phone and same issue. So I tried both sims in my older Nokia N97 and I could dial out. This kinda worried me as I don't want to give in my S2 for repairs since it will be weeks till I get it back. My wife could phone me on the S2 and I could receive the call, but I could not phone out.
Next step for me was our famous friend Google - I saw other also having similar problem, but for slightly different reasons. Nonetheless, I followed some instructions and got it solved.
So I got into "Network Mode" on the phone and there are three options:
1 GSM/WCDMA (Auto mode)
2 GSM only
3 WCDMA only
I selected GSM and tested the phone and all of a sudden I could make and receive calls.
This morning I reverted back to option 1 and tall is fine.
Vodacom ... please explain why this happens. Thanks