I just got a nokia 6267 unlocked. I bought a 4GB SD micro from a retail store. This is my 2nd 4GB card and both card make my phone shut off and come back on. I don't have any problems with a 2GB. But with the HCSD 4GB I do. Nokia in the US weren't any help because they say it's not an american model. So I have to speak to someone in Europe.