Samsung SM-G386TZKATMB - Manual (Page 36)

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Displays your current battery charge level is very low (Charge:
~11% ‑ 5%).
Shows your current battery only has up to 4% power remaining and
will soon shutdown. (Charge: ~4% ‑ 1%).
Displays when connected to the EDGE network.
Displays when connected to the 3G network.
Displays when connected to the HSPA+ network.
Displays when your phone is communicating with the 4G LTE
network.
Displays when the Download Booster feature is enabled and
communicating.
Displays when the phone has detected an active USB connection
and is in a USB Debugging mode.
Displays when there is a new text message.
Displays when an outgoing text message has failed to be delivered.