Found this on the AT&T Wireless support pages:
What is the prorated (declining) Early Termination Fee?
New and renewing AT&T wireless customers who entered into a 1- or 2-year Service Commitment prior to June 1, 2010, have an Early Termination Fee (ETF) of $175 less $5 for each full month of Service Commitment completed.
New and renewing AT&T wireless customers who enter into a 1- or 2-year Service Commitment on or after June 1, 2010, and include certain specified equipment, have an ETF of $325, less $10 for each full month of Service Commitment completed. Otherwise the ETF is $150, less $4 for each full month of Service Commitment completed.
If you consider the 1st paragraph (prior to June 1, 2010)...and 16 months into my current contract...then..
$175 - 80 (16 X $5) = $95 which is very close to the $90 I was told.
If you consider the 2nd paragraph (after June 1, 2010)...and 16 months...
$325 - $160 (16 x $10) = $165
or
$150 - $64 (16 x $4) = $86
And I was told $90 so AT&T better stick to that!!!