Arduino Uno + GSM Shield, Band Management


I've an Arduino Uno and GSM Shield connected. Example programme GSM_Tools/TestModem is working fine. However, the example programme GSM_Tools/GSMScanNetwork is not working.

  1. Is the band selection critical? I've check the link,, and found out the band for Singapore where I resided.

Singapore 900 1800 3G 2100

Do I need to change the band to: E-GSM(900)+DCS(1800)?

  1. How about the 3G 2100? Can the GSM Shield work with 3G network?

Many thanks...

You must use a configuration that includes E-GSM(900) and DCS(1800) bands, although includes other bands.
The GSM Shield doesn’t work with 3G.