I have a Nokia 6600. Can I buy a non-Dual Voltage MMC? Or it must be a DV MMC for it to be compatible?

My previous memory card was broken. I wanted to buy a new one. But when I was on the shop to buy an MMC, the vendor said that what they're selling were single voltage MMC's only and it may not fit my 6600. My question is: Does my phone support any MMC or ONLY a dual voltage (DV MMC) can fit? Thanks.