Yes, but you will need to get the "data only" Sidekick Prepaid plan that will allow for unlimited emailing, texting, internet and instant messaging for a $1 a day! Phone calls will cost you $0.15 a minute with the Sidekick Prepaid Plan.
Reference:
http://www.t-mobile.com/shop/plans/Prepaid-Plans.aspx
An eBay seller has the Prepaid SIM Card Data Kit for $14.99 with 10 days of service here:
http://shop.eBay.com/merchant/vanmobi_W0QQ_nkwZQQ_armrsZ1QQ_fromZQQ_ipgZ
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You can use any T-mobile phone with their prepaid plan, you simply need to install the correct sim card in the phone of your choice.