sony Ericsson GC89 EDGE/Wireless LAN PC Card

I purchased two of these cards and only when it arrived, I realised that they are locked to the TMobile network, which makes it useless to me because I want to use sim cards from other networks on the cards. When I contacted the seller, they are asking that I return the items, but it is costing me more for shipment return than the cost of the cards because I live in Trinidad. The site had no information indicating that the cards were locked to TMobile, which I found VERY misleading and caused my purchase.

Driver for card was on the XP site. Item was used on a old Sony Viao computer that a kid uses to browse the internet and watch movies from a remote router. Works great for this and for the price can afford to throw it away when We u[grade.