For Nokia S60 3rd Phones, Nokia N-Series and Nokia E-Series
There is almost no way yet known to hack the memory card password in
case of these types of phone but there is a way to do it some of the s60 3rd edition phones and almost all the E-series phones.
The remote lock option in E-Series phone allows you to unlock your phone by sending a sms.
The only thing you have to do is to activate this feature by going to Tools | Settings | Security | Phone and SIM | Allow remote lock menu. The password of your memory card will be your remote lock message.
So you have to just send a sms containing your remote lock message that will automatically change your memory card passsword.
