Have bought a 256MB MMC card for my 6230. I can easily recommend it to anyone that investment. Pickled, formatted and already has one "infinite" amount of space for MP3s (or videos, pictures ...). The pace is very fast and you notice no difference to the supplied map. Only that one now has a lot more storage capacity. The purchase of such a card constitutes an already good phone back without a practical MP3 player. And at a really good price. Can only be recommended. Therefore, enough said. Just buy and be amazed.