For mobile payments to really take off, the functionality needs to be available to far more than merely the latest devices. For this reason, the SD Association, a non-profit that sets memory card standards, is pushing a means to use microSD cards to make otherwise incompatible devices compatible.

The SD association calls this technology smartSD. The technology apparently enables a secure element for Host Card Emulation, a necessary step for creating digital copies of payment cards the way we've seen in Google Wallet and Android Pay. SmartSD uses a device's native NFC, removing the need to embed such technology into the card directly.

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