Or micro sd card?
Does the iphone 5 have a sd card?
For your general information, no apple mobile products like iPad, iPhone, iPod have the capability to add external storage.
None of the handheld products manufactured by Apple come with a micro SD card slot. Although, you COULD buy the 64 GB iPhone 5 if storage is what you want. Moreover, iPhone 5 is also offered in 16 and 32 GB variants.