Use them in the Nokia 5230. It works reliably and quickly, in any case I have nothing to complain about in this regard. Have you been almost 2 months in use. Mainly I needed it to accommodate all the maps for navigation on mobile phones. Have also tried the adapter with me and it works. Another note for people who also want to download the Nokia Ovi Maps material on the memory card: You can not "all" cards (ie, entire world-maps) in a data packet transmitted at once to the memory card (are approximately 5.5 GB), since the memory card is formatted as usual with the file format FAT 32, that it can never be more than 4 GB of data "at once" in a data packet is transmitted on it - otherwise it returns an error message. So make transmission portions, such as Europe, Africa, ....