remove unused code

main.py

@@ -34,16 +34,6 @@ def get_devices_ports() -> list:
     return MODEM_POOL_PORTS
 
 
-def has_sim(ser) -> bool:
-    # check pin
-    cmd_check_pin = "AT+cpin?\r"
-    msg = send_command(cmd_check_pin, ser)
-    if b'OK' in msg:
-        return True
-    else:
-        return False
-
-
 def send_command(cmd: str, ser, wait_time_in_s: int = 0) -> bytes:
     ser.write(cmd.encode())
     msg = ser.read(100)
@@ -57,11 +47,6 @@ def send_command(cmd: str, ser, wait_time_in_s: int = 0) -> bytes:
     return msg
 
 
-def get_phone_number(ser):
-    cmd = "AT+CNUM\r"
-    send_command(cmd, ser)
-
-
 def create_modem_for_port(port: str) -> Union[SerialModem, None]:
     logger.info('Initializing modem... for ' + port)
     # Uncomment the following line to see what the modem is doing: