There are several things that can cause your Hotspot to show error messages for this first light. If your hotspot cannot connect, it may bring you to a webpage the looks like a T-Mobile website asking for a password to get in. This is the Hotspot's internal settings page. This means you are having a connection issue.
Solid Blue - Registered and connected to network.
Flashing Blue -
Solid Red -
This should light up when you are connected to it.
Solid Blue - Wi-Fi is active.
We will not be using the SMS feature. You can ignore this.
Solid Blue - New message
Flashing Blue - Message inbox is full.
Solid Blue - Full charged.
Rapidly Flashing
Blue - Working / The battery is being charged.
Flashing Red - The battery level is less
than 10%.