i-Smartphone 3G will not work on phones with Firmware 2.1

I have one as well. It doesnt work. Period. Itll work for about an hour, then give you a No SIM error. (Atleast thats what it did for me)

I demanded a replacement, they sent me a Q-SIM this time, which worked for 4 hours, and then again No SIM error.

I suggest you get a refund, and buy a Virgin SIM.