I have a ledger nano S where i keep some funds on, and in order to send and receive easily (before they developed the x version) i installed a coinomi wallet on my phone using the same seed.
..welp. That pretty much completely defeats the purpose of using a hardware wallet— for the recovery seed to be ONLY be secured in your Ledger device, and offline on a piece of paper. It's like you bought this very expensive safe to store some very confidential documents but yet you have a copy of the same confidential documents on your coffee table. You know what I'm sayin?