I'm wondering if I have all my facts down. If not, please correct me. Trying to figure something out for a friend. NNIDs may be linked to only a single 3DS at any time and when you log in with your NNID on a particular 3DS, the NNID will be linked to that 3DS. Deleting an NNID will result in removing not just the information stored on your 3DS, but your entire NNID including purchases made on your Wii U. The only way to log out of your NNID is by formatting the 3DS, however that doesn't remove the linking between the NNID and the 3DS. If you want to remove the link between your NNID and a particular 3DS, you must perform a System Transfer to another 3DS. In a case where you can't perform a System Transfer, you have to call Nintendo and ask them to remove any links your NNID has to an existing 3DS. When you have formatted your 3DS, another person can use it to log in with their NNID. However, you can't login with your NNID on any other 3DS... ...because your NNID is still linked to that same 3DS. The other person's NNID will also be linked to it, and the same principles now apply to them as well. Is all the above correct? And as I understand it, if you call Nintendo then they may or may not help you with unlinking your NNID from an existing 3DS. I've heard mixed reports on this, sometimes reading you have to lie you've lost/broke your 3DS to have Nintendo help you. Does anyone have any input to that? It'd be much appreciated.