Put it at the end of a phone call scene, right after the Discord Call sound has set up the conversation, then follow it with the Classic Error sound once the call cuts out to sell the dead phone.
About this sound
This is the short low-battery alert Apple devices play during a call when power is almost gone, a brief electronic chime lasting under a second. It feels urgent and slightly awkward, like a warning cutting into a conversation you do not want to end. It comes from iPhone OS 2 onward and iPadOS 13 onward, where it is heard only while on a call.