Assuming a $25 contract I guess?
$600.99 or $600.99 - the cost of 2 years worth of credit - two years worth of phone usage?
Now this number will be maybe $450. Some "throwing numbers about" puts two years of credit at $85. So that is $515.99 for the phone + mobile contract. Take away the phone ($450.99) and you have a mobile contract at $32.50 a year or under $3 a month.
I'm not sure I see that as all that bad.