USSD कोड क्या है? What is USSD Code

🔍 What Are USSD and Dialer Codes?

USSD codes are protocols used by GSM cellular telephones to communicate with the mobile network operator’s computers. They often start with an asterisk (*) and end with a hash (#), such as *#06#.

Other hidden codes, particularly for diagnostics and internal testing, open engineering menus or testing modes that aren’t available through normal settings.

Know Everything About USSD(FAQs) Click Here

📱 Top Secret Android Dialer Codes

Note: Some codes may not work on all phones or brands due to manufacturer restrictions or carrier limitations.

Code	Function
`*#06#`	Displays the phone’s IMEI number (International Mobile Equipment Identity)
`##4636##`	Opens the Testing menu: Phone info, battery info, usage stats, Wi-Fi info
`##7780##`	Performs a factory data reset (soft reset)
`27673855#`	Hard reset – wipes all data and reinstalls firmware (use with caution)
`##34971539##`	Displays camera firmware details
`#0#`	Opens the hardware diagnostic test mode (Samsung only)
`##232338##`	Shows Wi-Fi MAC address
`##1472365##`	Tests GPS functionality
`##0289##`	Tests audio functions
`##2664##`	Tests touch screen input

🍏 Hidden Codes for iPhone (iOS Devices)

iOS doesn’t allow the same level of access as Android, but several network-level and diagnostic codes still work.

Code	Function
`*#06#`	Shows the IMEI number
`3001#12345#`	Opens Field Test Mode: access raw signal data (RSRP, dBm, etc.)
`*#67#`	Check call forwarding when busy
`*#21#`	Displays call forwarding settings
`*#61#`	Shows call forwarding delay information
`*#31#`	Toggle caller ID on/off
`*43#` / `#43#`	Enable/disable Call Waiting
`##002#`	Cancels all call forwarding settings

🧪 What Can These Codes Do Scientifically?

These codes reveal information and control parameters stored in the baseband processor, modem firmware, or system kernel—often inaccessible via standard settings.

For example:

*#*#4636#*#* on Android taps into Android’s internal telephony APIs, revealing data such as LTE band usage, signal strength (dBm), and network type.
iOS Field Test Mode reveals real-time cell tower handoff data, RSSI, and signal-to-noise ratio, useful for network engineers.

⚠️ Important Safety Tips

Use caution with codes that trigger resets or firmware modifications.
Many manufacturer-specific codes (e.g., for Samsung, Xiaomi, Huawei) may void warranty or brick the phone if misused.
These features are meant for diagnostic or engineering use—not entertainment.

🧠 Conclusion: Your Dialer is Smarter Than You Think

Your smartphone dialer is more than a number pad—it’s a gateway to the core of your device’s operating system and network intelligence. While not all users will need to dive into these codes, knowing their purpose can help you better understand how your phone functions beneath the surface.

Whether you’re a curious tech enthusiast or a mobile diagnostic pro, these secret codes represent a hidden layer of mobile technology waiting to be explored.

📱 USSDकोड क्या है?

Read in English/ हिन्दी में पढ़ें

USSD (Unstructured Supplementary Service Data) कोड वो छोटे-छोटे कमांड होते हैं जो मोबाइल नेटवर्क से विशेष जानकारी प्राप्त करने के लिए डायलर में डाले जाते हैं। ये कोड आमतौर पर * (स्टार) से शुरू होकर # (हैश) पर खत्म होते हैं, जैसे *#06#।

इन कोड्स का उपयोग मोबाइल की छिपी हुई सेटिंग्स, नेटवर्क जानकारी, टेस्टिंग मोड और हार्डवेयर चेक करने के लिए किया जाता है।

अधिक जानें USSD(FAQs) Click Here

📲 टॉप सीक्रेट एंड्रॉइड डायलर कोड

कोड	कार्य
`*#06#`	IMEI नंबर दिखाता है
`##4636##`	मोबाइल, बैटरी, Wi-Fi की जानकारी और उपयोग आँकड़े
`##7780##`	फैक्ट्री डाटा रीसेट (सॉफ्ट रीसेट)
`27673855#`	हार्ड रीसेट (सावधानी से उपयोग करें)
`#0#`	हार्डवेयर टेस्ट मोड (Samsung)
`##232338##`	Wi-Fi MAC एड्रेस
`##1472365##`	GPS टेस्ट
`##0289##`	ऑडियो टेस्ट
`##2664##`	टच स्क्रीन इनपुट टेस्ट

🍏 आईफोन के छिपे हुए कोड

कोड	कार्य
`*#06#`	IMEI नंबर दिखाता है
`3001#12345#`	फ़ील्ड टेस्ट मोड – नेटवर्क की सिग्नल डिटेल्स (RSRP, dBm)
`*#67#`	कॉल फॉरवर्डिंग की स्थिति
`*#21#`	सभी कॉल फॉरवर्डिंग विकल्प
`*#61#`	रिंग टाइम डिले
`*#31#`	कॉलर ID ऑन/ऑफ
`*43#` / `#43#`	कॉल वेटिंग चालू/बंद
`##002#`	सभी कॉल फॉरवर्डिंग हटाना

🔬 इन कोड्स के पीछे का विज्ञान

इन कोड्स के ज़रिए मोबाइल फोन के बेसबैंड प्रोसेसर, नेटवर्क मॉड्यूल, और सिस्टम API तक एक्सेस मिलता है। ये कोड डिवाइस के हार्डवेयर और नेटवर्क से रीयल टाइम डेटा एक्सेस कर सकते हैं, जो सामान्य यूजर इंटरफ़ेस से संभव नहीं होता।

जैसे:

*#*#4636#*#* से नेटवर्क की RSRP वैल्यू, LTE बैंड और सिग्नल स्ट्रेंथ जैसी तकनीकी जानकारी मिलती है।
iPhone का Field Test Mode नेटवर्क इंजीनियरों के लिए बेशकीमती टूल है।

⚠️ सावधानी जरूरी है

रीसेट या फर्मवेयर को प्रभावित करने वाले कोड्स को सोच-समझकर उपयोग करें।
कुछ कोड निर्माता-विशिष्ट (Samsung, Xiaomi) होते हैं और गलत उपयोग से फोन डैमेज हो सकता है।
ये कोड्स मुख्य रूप से तकनीकी परीक्षण और डिवाइस डाइग्नोसिस के लिए बनाए गए हैं।

📚 निष्कर्ष: आपके डायलर में छुपे हैं अनगिनत रहस्य

आपका मोबाइल डायलर सिर्फ नंबर डायल करने का टूल नहीं है—यह आपके डिवाइस के हार्डवेयर, नेटवर्क, और सिस्टम के भीतर झांकने का एक वैज्ञानिक रास्ता है। यदि सही तरीके से इस्तेमाल किया जाए, तो ये कोड आपके मोबाइल को बेहतर समझने और मैक्सिमम उपयोग करने में मदद कर सकते हैं।

FAQs About USSD

📱 General Understanding of USSD

Q1: What is USSD and how does it work on mobile phones?
A1: USSD (Unstructured Supplementary Service Data) is a communication protocol used by GSM cellular phones to interact with the mobile network operator’s computers. It enables real-time, session-based communication between the user and the network, allowing for services like balance checks, mobile banking, and menu-based information services. (Wikipedia)

Q2: How does USSD differ from SMS and mobile data services?
A2: Unlike SMS, which is store-and-forward, USSD establishes a real-time connection during a session, allowing for interactive communication. USSD doesn’t require an internet connection, making it faster and more efficient for certain services compared to mobile data. (Wikipedia)

Q3: What are the advantages of using USSD over other communication protocols?
A3: USSD is advantageous because it doesn’t require an internet connection, works on all GSM phones, and provides real-time interaction. It’s cost-effective and doesn’t consume device memory or require installation of additional applications.

Q4: Can USSD be used without an internet connection?
A4: Yes, USSD operates over the GSM network and doesn’t require an internet connection, making it accessible even in areas with limited or no internet connectivity. (Wikipedia)

Q5: What are the common use cases for USSD in mobile networks?
A5: Common use cases include checking account balances, recharging prepaid services, mobile banking transactions, accessing customer support menus, and subscribing to or unsubscribing from services.

🔐 Security and Privacy Concerns

Q6: Is USSD secure for conducting mobile banking transactions?
A6: USSD is considered relatively secure for mobile banking as it doesn’t store information on the device and operates in real-time. However, it’s essential to ensure that sensitive information isn’t displayed or stored insecurely on the device.

Q7: What are the potential security risks associated with USSD codes?
A7: Potential risks include interception of USSD messages by malicious entities, especially if the network is compromised. Additionally, phishing attacks can be conducted by prompting users to enter sensitive information via USSD. (Wikipedia)

Q8: How can I protect my personal information when using USSD services?
A8: To protect personal information, avoid sharing sensitive data via USSD unless it’s through a trusted service. Always verify the USSD codes and services you’re interacting with and be cautious of unsolicited prompts.

Q9: Are there encryption standards applied to USSD communications?
A9: USSD messages are not encrypted end-to-end, which means they can be vulnerable to interception. The security largely depends on the mobile network operator’s infrastructure. (Wikipedia)

Q10: Can USSD sessions be intercepted or spoofed by malicious actors?
A10: While USSD is relatively secure, there’s a possibility of interception or spoofing if the mobile network is compromised. Users should be cautious and report any suspicious USSD activity to their service provider. (Wikipedia)

📲 Usage and Functionality

Q11: How do I check my mobile balance using USSD codes?
A11: Dial the specific USSD code provided by your mobile operator (e.g., *123#) and press the call button. Your balance information will be displayed on the screen.(Seevl)

Q12: What are the steps to subscribe or unsubscribe from services via USSD?
A12: Dial the USSD code associated with the service (e.g., *121#), navigate through the menu options to subscribe or unsubscribe, and follow the prompts provided.

Q13: Can I access customer support through USSD menus?
A13: Yes, many mobile operators offer customer support options within their USSD menus. Dial the operator’s USSD code and navigate to the customer support section.

Q14: How do I find the correct USSD code for my mobile operator?
A14: Visit your mobile operator’s official website or contact their customer service to obtain a list of available USSD codes.

Q15: What should I do if a USSD code returns an error or fails to execute?
A15: Ensure that you’ve entered the correct code. If the problem persists, restart your phone, check for network issues, or contact your mobile operator for assistance.

🛠️ Troubleshooting and Technical Issues

Q16: Why am I receiving “Connection problem or invalid MMI code” errors?
A16: This error can occur due to network issues, incorrect code entry, dual SIM conflicts, or software glitches.

Q17: How can I fix USSD code errors on my Android device?
A17: Try the following steps:

Toggle Airplane mode on and off.
Restart your device.
Check for software updates.
Reset network settings.
If using a dual SIM phone, disable one SIM temporarily. (Guiding Tech, UMA Technology)

Q18: Are there differences in USSD code functionality across different phone models?
A18: Yes, some USSD codes may function differently or may not be supported on certain phone models or operating systems.

Q19: What steps should I take if USSD codes are not working after a software update?
A19: Reset network settings, check for additional updates, or contact your mobile operator. If the issue persists, consider performing a factory reset after backing up your data.

Q20: How do I reset network settings to resolve USSD issues?
A20: Go to Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth. Confirm the reset and restart your device. (UMA Technology)

🌐 Regional and Operator-Specific Queries

Q21: What are the USSD codes for checking data balance on [Operator Name] in India?
A21: USSD codes vary by operator. For example:

Airtel: *121#
Jio: *333#
Vi: *199#
BSNL: *123#(TechMaina)

Q22: How do I activate international roaming via USSD on [Operator Name]?
A22: Dial the specific USSD code provided by your operator for international roaming activation. Alternatively, contact customer service for assistance.

Q23: Are USSD codes standardized across different countries and operators?
A23: No, USSD codes are not standardized and can vary between countries and operators. Always refer to your operator’s official resources for accurate information.

Q24: How can I find the USSD codes specific to my region or mobile provider?
A24: Visit your mobile operator’s official website, contact their customer service, or check the user manual provided with your SIM card or device.

Q25: What are the common USSD codes used in [Country Name] for mobile services?
A25: Common USSD codes vary by country and operator. For accurate information, refer to your local mobile operator’s official resources.

🧑‍💻 Developer and Integration Questions

Q26: How can developers integrate USSD functionality into mobile applications?
A26: Developers can integrate USSD by interfacing with the mobile network operator’s USSD gateway using APIs. This typically involves setting up a service that can handle USSD requests and responses.

Q27: What APIs are available for USSD service development?
A27: APIs for USSD service development are usually provided by mobile network operators or third-party aggregators. These APIs allow developers to send and receive USSD messages through their applications.

Q28: Are there any open-source tools for testing USSD applications?
A28: Yes, tools like Kannel and Jasmin SMS Gateway can be used to simulate USSD sessions for testing purposes.

Q29: How do I simulate USSD sessions for application development purposes?
A29: Use USSD simulators or testing tools provided by mobile network operators or third-party vendors. These tools allow developers to emulate USSD sessions without needing a live network.

Q30: What are the best practices for designing user-friendly USSD menus?
A30: Best practices include keeping menus

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