Tried it in my E63 and it works fine. I can switch between the two with the special Menu Icon that shows up and interestingly both the sims had 3G symbol on. Tried calling each one of them through my landline, and it works. Next put it in my n900. Sim 1 comes up fine and I can make and receive calls, but I cannot switch to SIM 2. tried 2, Talk - > Requesting - Invalid tried 002, Talk - It tries to dial that number and the dial fails. So how do I switch ?