Here is a quick video showing off a 15$ android phone that is acting as a cold storage device.
All you will need is an android phone that is used for NOTHING else
A micro sd card USED FOR NOTHING ELSE
and to download a copy of a bitcoin wallet APK ( I chose mycelium here https://mycelium.com/)
You can sweep the funds in a couple of ways, the easiest would be connect to a secure wifi and send the funds to your main wallet. You can also use another wallet with sweep feature or just use the private keys directly.
Original of the video here