android as gsm modem using USB cable

brahim bn

2y839C#

how can i make my android phone act as gsm modem to send sms from my cellphone using c# code (AT commande)
notice hat i want to use usb cable as comunniation between my cell phone and my pc , it cant appear the PORT COM ? how can i do please

3 Replies

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Tuhin Paul2y ago
Accepted answer
Using an Android phone as a GSM modem to send SMS from your PC via USB and AT commands involves a few steps. However, it's important to note that Android phones typically do not expose a COM port directly over USB, so you may need to use a specialized tool or library that supports USB communication with Android devices.

Here is a general outline of the process:
Enable USB Debugging on Your Android Phone:
- Go to "Settings" on your Android phone.
- Navigate to "About phone" or "System" (depending on your device).
- Find and tap on "Build number" seven times to enable Developer Options.
- Go back to "Settings" and find "Developer options."
- Enable "USB debugging."
brahim bn2y ago
ijust tried what are you saying, i made my celle phone as develolper mode but when i cennect my cellphone using usb cable it cant reconized as modem and i cant get the com port ?
Naimish Makwana2y ago
To use your Android phone as a GSM modem and send SMS from your PC using C#, you can follow these steps:
1. Connect your Android phone to your PC via USB cable. Make sure USB debugging is enabled on your Android phone. You can enable it from the Developer Options in your phone’s settings.
2. Identify the COM port. When you connect your phone to your PC, it should be recognized as a modem. You can check the COM port of the modem from the Device Manager on your PC.
3. Use a SerialPort object in C#. You can use the System.IO.Ports.SerialPort class in C# to communicate with your phone. You need to set the PortName property of the SerialPort object to the COM port of your phone.
Here is a sample code snippet that demonstrates how to send an SMS using AT commands:
```
using System.IO.Ports;
using System.Threading;

SerialPort sp = new SerialPort();
sp.PortName = "COMx";  // replace with your port number
sp.Open();

sp.WriteLine("AT" + Environment.NewLine);
Thread.Sleep(100);

sp.WriteLine("AT+CMGF=1" + Environment.NewLine);
Thread.Sleep(100);

sp.WriteLine("AT+CSCS=\"GSM\"" + Environment.NewLine);
Thread.Sleep(100);

sp.WriteLine("AT+CMGS=\"" + phoneNumber + "\"" + Environment.NewLine);  // replace phoneNumber with the recipient's number
Thread.Sleep(100);

sp.Write(message + (char)26);  // replace message with your SMS text
Thread.Sleep(100);

sp.Close();
```
Please replace "COMx" with your actual COM port number, phoneNumber with the recipient’s phone number, and message with the text you want to send1.

Remember, this is a basic example. In a real-world application, you would want to add error checking and exception handling. Also, please be aware that sending SMS messages in this way may incur charges on your mobile plan.

If you can’t see the COM port in your Device Manager, try using a different USB port or a different USB cable. If that doesn’t work, you may need to install or update the USB driver for your phone2.

Please note that not all Android phones support acting as a GSM modem, and the exact steps may vary depending on the make and model of your phone2.