I just purchased a Macbook and need to access the internet while traveling. I am optimistic that iPhone tethering will be available within the next 2 years, so I don't want to sign a contract. Are there any options to go month to month? I assumed it was like cell phone contracts so I bought a Sprint USB thing on eBay and called to activate and they told me I could only do it with a year contract. Any help would be greatly appreciated.