Hi,
I would like to suggest cold storage solution within Bitcoin Wallet like the one employed within electrum and armory.
Meaning one phone is connected to the internet to transmit transactions and another phone as cold storage and for signing transactions.
Transactions can be easily transferred between both devices by using qr code or bluetooth which is more convenient than pc cold storage solution and more portable as well.
I have an old phone that I want to use as cold storage and do offline signing but there seems to be no solution for this yet.
I believe many others like me have an old phone that is just collecting dust so I think addition of this feature would be great.
People can give a new purpose to their old phones as hardware wallets.
I hope you guys would look into this. Thanks.