Mine was activated after 2 weeks, they never switched it on the first time round. When I went to the shop they fixed it quickly and it was on in about 1 and a half hours
Just recently did an MTN upgrade. Was told 24 hours. It didn't happen. I called 808, and they activated immediately ... took about 30 mins after the call for the BIS to activate. This is your best bet.
Wait til you get the message saying it is activated. They told me to wait "until the edge became EDGE" and then it would be ready. Not so. I used my whole contract amount in one day browsing before the BIS was actually activated. Anyway, once it's up and running, it's awesomeeeeeee