So locking of the iPhone 3G was a myth? Maybe, someone tested and confirmed that the iPhone 3G works on a PAYG SIM. This guy made an experiment with a SIM that he uses on his first generation iPhone and reported that he even got 3G connection in a Wi-Fi hotspot.
Please remember that we are not talking about pwn iPhone but we are talking abou the cocconed iPhone on which we can use un-pwn option. This is the best practice that the finder has to share with us:
Should your feature pack expire, you’ll be charged at a very high per-kilobyte rate. Call 611. Say “Buy Features”. Which store? Say “Media Net”. Listen to the three choices. Say “Unlimited” and then “Buy It”. Quit with “I’m done here.” You can “Check my feature packages” by calling 611.
Remember this is a Pay as You Go SIM.