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Here are all the common memory cards that handsets use. The text is a quotation from Wikipedia.

See more info about the cards from Wikipedia: MMC and RS-MMC, SD, miniSD, and microSD.

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MMC is about the size of a postage stamp: 24 mm x 32 mm x 1.5 mm. MMC originally used a 1-bit serial interface, but newer versions of the specification allow transfers of 4 or sometimes even 8 bits at a time. MMC cards can be used in any device which supports SD cards. MMC cards are currently available in sizes up to and including 4 GB
MMC front and back
RS-MMC front and back RS-MMC

MMC cards also come in a smaller form factor, of about half the size: 24 mm × 16 mm × 1.5 mm. This alternate form factor is known as Reduced-Size MultiMediaCard, or RS-MMC. RS-MMC cards are simply smaller MMC cards; by using a simple mechanical adapter to elongate the card, an RS-MMC card can be used in any MMC (or SD) slot. RS-MMC cards are currently available in sizes up to and including 2 GB.

Newer RS-MMC cards support a lower voltage (1.8 V instead of 3 V) mode to reduce battery demand. These lower-voltage RS-MMC cards are known as Dual-Voltage Reduced-Size MMC (DV RS-MMC), and can be marketed as MMCmobile when they meet the MMCmobile card standards. These low-voltage cards are backwards compatible with older RS-MMC devices. The dual-voltage cards, and the MMCmobile are part of the MMC 4.x standards. Note that the older single-voltage cards are not compatible with most of the new phones, so be sure to always get a dual-voltage card.
Secure Digital (SD)

Secure Digital (SD) is a flash memory (non volatile) memory card format used in portable devices. SD cards are based on the older MultiMediaCard (MMC) format, but most are physically slightly thicker than MMC cards. Most offer a write-protect switch on the side. SD cards measure 32 mm × 24 mm × 2.1 mm.

Devices with SD slots can use the thinner MMC cards, but the standard SD cards will not fit into the thinner MMC slots.
SD Card front and back
miniSD and it's adapter miniSD

The miniSD card was adopted in 2003 by the SD Association as an ultra-small form factor extension to the SD card standard. While the new cards were designed especially for use in mobile phones, they are packaged with a miniSD adapter which enables compatibility with all devices equipped with a standard SD Memory Card slot.

MiniSD cards are available in capacities ranging from 16MB to 2GB. These cards measure 21.5 mm × 20 mm × 1.4 mm.

At 15 mm x 11 mm x 1 mm — about the size of a fingernail — the microSD is currently the smallest memory card format commercially available. It is about one-fourth the size of a standard SD card but can be inserted into an adapter which allows the card to be used in devices with an SD card slot. All Devices which support SD cards support microSD with the SD card adapter which is often included in the packages.

As of May 2006, microSD cards are commonly available in capacities of 128 MB, 256 MB, 512 MB, and 1 GB.
microSD and it's adapter