Nokia N73 Memory Card: Reader !!top!!

2GB. The N73 does not support SDHC (High Capacity) cards, meaning cards larger than 2GB likely will not be recognized by the phone or older readers. Voltage: 3.3V 11-pin. Choosing the Right Memory Card Reader

Insert the SIM and memory cards - Nokia 1.3 user guide - HMD nokia n73 memory card reader

If you don't have the SD adapter, buying a specific RS-MMC reader is tricky; they are largely obsolete. they are largely obsolete.