Standalone 328p and UART

Using Arduino Microcontrollers
5

Well, i did this little test:

void setup() {
  // put your setup code here, to run once:
//Serial.begin(57600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print("oscal: ");
  Serial.println(OSCCAL, HEX);
  OSCCAL+=5;
  delay(1000);
}

and i figure with OSCAL=30 UART works ok, so i add OSCAL=0x30 to setup(). The original (non working OSCAL was 45).

Now i wonder if this has impact in the code? These boards grab values from some sensors and send them to the cloud with a GPRS module...