Nobody should be using the Galaxy Note 7. The line is done, no more will be produced, and Samsung wants you to return the phone to your point of purchase.
That last part is the tricky bit. You can't just ship back any phone to Samsung and expect a refund. You need to talk to the carrier or store you got it from. Be aware that all the retailers below say they have waived restocking and exchange fees, so if a clueless retail drone tries to charge you one, stand firm and demand to speak to their boss.
Samsung changed its policy effective 3 p.m. ET on Oct. 13. As of now, all retailers should be offering an exchange or full refund for your Galaxy Note 7 and its accessories. If you get any debate over this, show the retailer this official Samsung Web page.
As of this writing, the wireless carriers' websites haven't caught up with Samsung's expanded recall policy. Samsung is now saying that carriers participating in its bill credit scheme will give you a $100 bill credit if you exchange your Galaxy Note 7 for another Samsung phone, and a $25 bill credit if you simply return it or exchange it for any other phone.
If you already got a $25 bill credit and exchanged your phone for a Samsung phone, they'll add another $75 so you get the full $100.
AT&T, Sprint, and T-Mobile say on their websites that they are participating in the bill credit scheme. Right now, U.S. Cellular and Verizon do not say that, but that may change later today.
If you bought your phone online, the retailer will send you a special prepaid box to ship it back in. Samsung says anyone who's confused can call 1-844-365-6197 for help.