He only needs a phone and a RADIO.
Money Heist Season 3, Episode 5
(MIMICS RADIO STATIC)
The Big Bang Theory Season 6, Episode 2
WALT JR.:
V-8, 470 horses, 20-inch rims,
satellite RADIO, Bluetooth.
Breaking Bad Season 4, Episode 7
Give me your RADIO.
Money Heist Season 3, Episode 2
It sounds like an encrypted RADIO system.
Money Heist Season 3, Episode 4