You may be thinking of those Cell phone company access cards. That's not what you have.
To see why the latency is so big, calculate how many milliseconds it takes to travel to and from the geostationary satellite you are using.
I have Direcway Satellite internet and the latency is way to bad to play MMOs with it. I have heard that if there is a wireless access tower in my area i can connect to that and have decent latency for playing online games. If anyone has any info about locating a tower in my area, or any other solutions please let me know.