arduino nano

#include <SoftwareSerial.h>

SoftwareSerial BTSerial(10, 11); // RX | TX

void setup() {
pinMode(9, OUTPUT);
digitalWrite(9, HIGH);
Serial.begin(9600);
Serial.println("Enter AT commands:");
BTSerial.begin(38400); }

void loop() {
if (BTSerial.available())
Serial.write(BTSerial.read());

if (Serial.available())
BTSerial.write(Serial.read());
}

This program works fine for Arduino Uno but not for nano.