So we're hanging around in the TUAW back room, drinking coffee and comparing iPhone 4S war stories when I point out that I could have saved a bit of cash by cancelling AT&T and hopping over to Verizon.
AT&T penalizes many of its first-day-iPhone 4 customers by $250 for buying the first-day iPhone 4S. Verizon and Sprint do not. If you stood on line to buy your AT&T iPhone 4, your current cancellation penalty (your ETF) is likely to hover around $165 unless you're a preferred customer. (You can calculate that value over at Wolfram Alpha.)
That's a good deal less than the $250 AT&T will add to the base price of their units. Loyal first day iPhone 4 AT&T customers are being penali
