In order to take advantage of the upgrade concession they are giving, you have to average $99 MRC per line on your account before taxes.
Using my example:
My line
$60 minutes
$30 data
$30 family messaging
$120 total
Wife's line
$9.99 minutes
$30 data
$39.99 total
159.99/2 = 79.99
So if you have 3 lines, you need to have $297 in MRC to be eligible 12-15 months into the contract.
my plan for 3 lines
total before tax 240
the primry line is the a blackberry that was upgraded 06/02/08 and is the only one eligible for the upgrade at the full discount price.