diff --git a/src/modem.rs b/src/modem.rs
index 36f4dd3..588f768 100644
--- a/src/modem.rs
+++ b/src/modem.rs
@@ -202,11 +202,6 @@ impl<UART: serial::Uart> Modem<UART> {
         self.send_command(Command::getbear())
     }
 
-    pub fn get_local_ip_addr(&mut self) -> Result<()> {
-        let _ = self.send_command(Command::get_local_ip_addr())?;
-        Ok(())
-    }
-
     pub fn connect_to_gprs_ap(&mut self, apn: &str, username: &str, password: &str)-> Result<()> {
         println!("init gprs ...");
         let _ = self.send_command(Command::gprs_init())?;
@@ -223,10 +218,6 @@ impl<UART: serial::Uart> Modem<UART> {
         Ok(())
     }
 
-    pub fn info(&mut self)-> Result<String> {
-        self.send_command(Command::modem_info())
-    }
-
     pub fn probe(&mut self)-> Result<String> {
         self.send_command(Command::probe())
     }
@@ -236,11 +227,6 @@ impl<UART: serial::Uart> Modem<UART> {
         Ok(res.contains("+CGATT: 1"))
     }
 
-    pub fn ping(&mut self, domain: &str)-> Result<()> {
-        self.send_command(Command::ping(domain))?;
-        Ok(())
-    }
-
     pub fn tcp_is_ssl_enabled(&mut self) -> Result<bool> {
         let res = self.send_command(Command::tcp_ssl_check())?;
         Ok(res.contains("+CIPSSL: (1)"))