SunTech ST3300 - Trouble Shooting (LED Indicator); Blue LED: Indicates WCDMA status.

ST3300 User Manual
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4. Trouble Shooting (LED Indicator)
4.1 Blue LED: Indicates WCDMA status.
WCDMA Blink Count Remarks
Normal 1
Server Com. Error 2
<Possible Cause>
1. Server or network parameter is wrong.
2. Server is closed.
3. Temporary network barrier
WCDMA Com.
Error
3
<Possible Cause>
1. Network parameter is wrong.
2. SIM is blocked about WCDMA using.
3. Temporary network barrier
4. Weak WCDMA signal
5. WCDMA antenna connection is not firm.
No Network 4
<Possible Cause>
1. WCDMA antenna is disconnected.
2. WCDMA antenna or socket of WCDMA antenna is
broken.
3. Device is broken.
SIM PIN Locked 5
<Possible Cause>
1. SIM PIN is enabled.
Cannot Attach
NW
6
<Possible Cause>
1. Weak WCDMA signal.
2. WCDMA antenna connection is not firm.
No SIM 7
<Possible Cause>
1. There is no SIM or SIM is not inserted properly.
2. SIM or SIM socket is broken.