gistfile1.ino

      // read the CCID
      fona.getSIMCCID(replybuffer);  // make sure replybuffer is at least 21 bytes!
      Serial.print(F("SIM CCID = ")); 
      Serial.println(replybuffer);
      break;
    }

  case 'i': 
    {
      // read the RSSI
      uint8_t n = fona.getRSSI();
      int8_t r;

      Serial.print(F("RSSI = ")); 
      Serial.print(n); 
      Serial.print(": ");
      if (n == 0) r = -115;
      if (n == 1) r = -111;
      if (n == 31) r = -52;
      if ((n >= 2) && (n <= 30)) {
        r = map(n, 2, 30, -110, -54);
      }
      Serial.print(r); 
      Serial.println(F(" dBm"));

      break;
    }

  case 'n': 
    {
      // read the network/cellular status
      uint8_t n = fona.getNetworkStatus();
      Serial.print(F("Network status ")); 
      Serial.print(n);
      Serial.print(F(": "));
      if (n == 0) Serial.println(F("Not registered"));
      if (n == 1) Serial.println(F("Registered (home)"));
      if (n == 2) Serial.println(F("Not registered (searching)"));
      if (n == 3) Serial.println(F("Denied"));
      if (n == 4) Serial.println(F("Unknown"));
      if (n == 5) Serial.println(F("Registered roaming"));
      break;
    }

    /*** Audio ***/
  case 'v': 
    {
      // set volume
      flushSerial();
      Serial.print(F("Set Vol %"));
      uint8_t vol = readnumber();
      Serial.println();
      if (! fona.setVolume(vol)) {
        Serial.println(F("Failed"));
      } 
      else {
        Serial.println(F("OK!"));
      }
      break;
    }

  case 'V': 
    {
      uint8_t v = fona.getVolume();