[ACHlLLES]

You only have initial purchase price of the phones. Following factors really matters alot more though.

For me here's the bottom line, and I do have both.

Iphone 3g(16gb) w/ ATT cost me 330 for the phone, around 130 for the first month, plus 85/mo x 23 = 2 years of use is about 2415.

SERO w/ Touch Pro cost me 330 (after rebate), 45/mo x 24 mo = 1410 for 2 years of use. I do have to mention SERO offer free text, and 7PM off-peak while ATT doesn't offer free text, and off-peak starts at 9PM w/ rollover.