Thanks for the link. And yes, the Ledger Nano is great. I have a Trezor (supports SegWit) myself. However, I also need a hot wallet for my iPhone so I always have some Bitcoin with me. I'm currently using the Bitcoin.com wallet, which I like, but it doesn't support SegWit.
Ledger Nano is great, it's OK. You haven't specified that what kind of iOS you have but as I read the above mentioned things I think you have some kind of laptop (sorry macbook
) or desktop, because you can use the Trezor (need for a full sized USB connector on your machine).
I'm just wondering if something like micro USB to apple lightning connector exist or not, but I would guess not, because on the android you can use the USB OTG function to connect your ledger Nano s or Trezor to e.g. a Mycelium mobile wallet, but I don't really know if it's possible on an iPhone or not. (Probably not).
Maybe if you want a hardware wallet, the Ledger Blue with bluetooth connection can be an option, but (this is just my opinion) I won't use any hardware wallet with bluetooth connection, I don't trust the bluetooth technology enough.
Maybe if you want to use a hot wallet on the iPhone, you can check if any of them can use your fingerprint for login and for confirmation