Simyo is one of German company E-Plus's brands. They only do PrePay and sell exclusively over the Internet. Recharging is via direct debit and credit card only.
Anyway, here's the thing: They've introduced rates for casual GPRS usage of EUR 0.24 per megabyte, which works out at NZ$0.46 by today's exchange rate.
Vodafone's equivalent rate is $0.10 for 10kB -- effectively $10.00 per megabyte. (Don't know what Telecom's rate is for whatever non-3G data standard they support.)
I knew that mobile telephony was more expensive here than in Europe, but who would have thought that GPRS service would ever be twenty times cheaper than in New Zealand?
Not for 3G though, only GPRS...