And what you were going to do is the reason they're increasing restocking fees and reducing trial times.
When you return a phone it CANNOT be sold as new again, even if you return it 5 minutes after it was activated. As soon as a phone is activated on a line, it activates the warranty on the device, and so even if you return it RIGHT after the rep activates it, it's warranty is voided for whoever would pick it up next.
Instead, they have to take that phone and run it through a battery of tests (which cost money) just to it can get the "Certified like new" sticker placed on it, and then it's either sold at a discounted price on contract or to someone who can't upgrade, or it's put in the pool of phones to swap out if someone has a warranty issue with their device. All three of these options mean less money to them, costs that MUST be made up somewhere. And when you're talking a heavily anticipated phone like the iphone where there are a TON of people who'd want one.. that lost "new" phone means a potential lost contract if the delay is long enough.
I haven't seen anything about this yet, but it makes sense if they do it. The Trial period isn't for people who KNOW they won't stick with a phone. Heck, it's not even there for those of us who arn't sure. It's for people who know (or think they know) why they want a given device, but they might think differently once they actually use it.
The restocking fee is there to make you think a little before impulsively buying a device you may not understand (and to discourage people from abusing it because they want to pay for a new toy)