I was wondering how much the total cost for me would be if I bought the iPhone 3G S and cancelled after 30 days. I have tMobile and will have the same plan for another 1.5 years. I understand that phone may not be unlocked by then but since it is already activated I could use it as an iPod touch in the meantime. Also does 35% live.com cashback off of ATT.com apply to the cost of the phone. Here is how I thought it would work out and I would appreciate it if anyone had more insight. Thanks. I appreciate your help. Cost: iPhone 3gs 16 gb= 200 * .65 (35% live.com cashback)= $140 Activation fee- $36- waived to $0 because of government employee discount Monthly Plan- $70 * .75= $52.50 (25% goverment discount) ETF= $175 Total= $140 + $0 + $52.50 + $175= $367.50. Does this add up correctly.