"GetSms" & "ReadSms": Not Working, but the start it's ok

What steps will reproduce the problem?

  1. trying using the “GSM_GPRSLibrary_SMS” example, the modem is correctly initiate but no any sms is read.
  2. Tried to use getSms instead of ReadSms like suggested to the output but nothing is changed
  3. I’m trying using Arduino Uno Rev 3 and GSM module in attachment

What is the expected output? What do you see instead?
Should I read sms, but nothing append seems blank

What version of the product are you using? On what operating system?
Arduino Uno Rev 3, tried Also with Arduino Mega 2560 without success

Please provide any additional information below.
In attachment you can find the right model …