I have a Virgin Mobile pre-paid phone.

I just bought my kids the factory reconditioned Vox 8610 phones that they have on their site right now for $24.95 with free overnight FedEx shipping. You only have to add $20 every 90 days to keep it active. There's no daily fee for them either, unless you want to set that up because you use it daily, otherwise it's 25 cents a minute until 10 minutes in that day, then it drops to 10 cents per minute for the rest of the day. I researched a lot of prepaid plans and found theirs to be the best deal.