Memory cards give you the ability to be flexible with your Siemens CT66 device. They allows you to store files, photos, music, and more. The best thing is that they are portable so you can use it with multiple devices and/or computers. Also, storing files on a memory card is a safe way to ensure that your data is protected and backed up at all times for your Siemens CT66 device. Extra memory is always helpful to have whether you are in school or at work. It is also handy to store all your favorite music and pictures too for instantly sharing with family and friends.