You could use mycelium, but I'd highly discourage that.
I currently use a Ledger HW.1 cold wallet instead of a trezor, because it's practically the same thing and 10x cheaper. If you have the funds, go for a trezor. I don't like how you need to always plug it in using a cable, though.
Where can you get these wallets and how much are thye I currently use my phone to store my bitcoins but im so scared I might lose them one day.