First let me say. My wife and I switched to Sprint when the Instinct came out. 6 months or so ago. After 30 days....we both HATED the phone. I could not find a way to get out. I came across this site
http://www.ucan.org/telecommunications/wireless/cancel_sprint_without_paying_early_termination_fee
What was going on here was the SAME thing the OP is talking about. Sprint increased some admin fees by like .53 cent or some crap. This voided the terms of the contract. As you can see from the site, there are TONS of conversations with online reps canceling accts. My convo is there, too. I did the online chat from my acct and said I wanted to cancel due to this increase. They cancelled our acct effect next cycle. We headed to ATT and got iPhones. So this stuff works!! It did with Sprint. Thing is like someone else said. They will probably let you out to port w/out an ETF, but I doubt you can say remove the ETF and let me go month to month. I am going to call ATT in the AM and inquire on this.
My convo with Sprint
Thank you for contacting Sprint. My name is Brittany. How may I assist you today?
12:24:23 PM Charles _
I want to cancel my acct.
12:24:37 PM Brittany A
I will be happy to assist you with that today. One moment while I access your account.
12:25:47 PM Brittany A
I must advise that there is a 200.00 early termination fee for each line on the account.
12:26:17 PM Charles _
due to the materially adverse change in the contract in the administrative fees, there should not be.
1:20:01 PM Komeshia
Thank you for your patience.
I have now cancelled your account, effective 2/19/09 which is the last day of the current billing cycle. You will not incur any early termination fees with this cancellation.
The full convo is on the site I posted above.