This guide will provide you with everything you need to know about Heist Prep HACKING DEVICE (Search the facility for the hacking device) in Grand Theft Auto 5 Online.
When you are inside the facility, you will get a message at the bottom of your screen saying “Search the facility for the hacking device”. So you will need to open up your phone and tap on the sightseer app at the bottom.
After that, you will find a signal string at the bottom right of your screen. You need to go to the location where the signals are high and you will find the hacking device.
