Home Technology 5 USSD Secrets Every Smartphone User Should Know

5 USSD Secrets Every Smartphone User Should Know

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6117 09073541
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USSD, or Unstructured Supplementary Service Data, often known as “Quick Codes” or “Feature Codes,” serves as a communication protocol for GSM cellular telephones to interact with the mobile network operator’s computers.

Typically initiated with an asterisk (*) and concluded with a hash (#), these codes, although less frequently dialed with the prevalence of smartphone apps, still offer valuable functionalities.






In the current age of smartphones, numerous applications cater to almost every conceivable need, potentially diminishing the reliance on USSD codes. Despite the decline in usage, here are five lesser-known USSD codes that may unravel additional capabilities and, in some cases, prove invaluable.

  1. *#06# – Display IMEI
    • The IMEI (International Mobile Equipment Identity) is a unique identifier for your device. Apart from aiding in tracking lost devices, knowing your IMEI is crucial for various purposes, especially when paperwork is inaccessible.
  2. *#07# – SAR Value of Your Smartphone
    • SAR (Specific Absorption Rate) quantifies the RF (Radio Frequency) energy absorbed by the body during mobile phone usage. With an accepted limit of 1.6 W/kg, any smartphone below this SAR level is considered “safe.” If your device surpasses this limit, it is advisable to replace it promptly.
  3. **21*number# – Activate Call Forwarding
    • This code initiates call forwarding, redirecting all incoming calls to a designated number. Useful when focusing on crucial tasks, it allows you to concentrate without constant interruptions. For instance, dialing **21*190# works seamlessly on MTN Uganda and Airtel Uganda.
  4. ##21# – Deactivate Call Forwarding
    • To cancel call forwarding, use this code. Your phone can now resume receiving calls as usual.
  5. *43# – Activate Call Waiting
    • Enabling call waiting permits users to suspend an ongoing call to accept a second one. Subscribers can switch between calls or merge them into a conference call. This service is commonly offered by major telecom providers in Uganda.
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While these USSD codes might not be as widely used today, exploring their functionalities can uncover hidden features and enhance your mobile experience.