CF modems were very popular during the reign of CompactFlash, but the transition to Secure Digital slots left many Pocket PC users without compatible modems to connect their handhelds to dial-up Internet Service Providers. Now, Socket's SDIO 56K Modem Card, for the first time, allows Pocket PCs with SDIO-compatible Secure Digital slots to dial into any V.90 or V.92 ISP.