This is a blatant commercial plug but I don't feel bad about it.
After ages with Voodoofone I've moved over to different gang named ThinkMobile (while keeping my number: porting works fine in this country). They resell both Tel$tra and Voodoofone, but with very decent customer support and both better features and price (for low-volume users like me) IMHO.
ThinkMobile is fishing for new customers and is happy to give both newbie and referrer $24 credit each. So, if you want to do me some good why not join up, quote MATES and my name and we both benefit a little?