Dude... check out the site...
http://nextelonline.nextel.com/NASAp...ink_SharePlans
This is what I have... 1500 mins. Not 600 and it's only 129 for 2 phones, addl phones 10 bucks I think. I too have a corporate discount and my bill is barely over 100 bucks with taxes and isurance and all that mess. But you are paying too much for only 600 mins.
p.