I did find this issue regarding dual voltage.
Nokia Support Discussions - Which memory card brand is compatible with Nokia N70? - Nseries Devices and S60 Smartphones - Nokia Support Discussions
This is useless support from Nokia:
http://knowledge.search.nokiausa.com/search/ui.jsp
Used n70 memory card as search terms.
Somebody on thir forums was interested in selling me a phone. They gave me this answer when I said, I got no information from "n70 memory card"
Chris: For all technical support and related matters, please contact our customer care and they will be able to assist you. Our Care Contact Center team are available by calling 1-888-665-4228. Our Center is open from Monday through Friday from 9:00 AM to 9:00 PM EST and Saturdays 10:00 AM to 7:00 PM EST. They will be able to better assist and provide you with the information you require.