Take the 2-minute tour ×
Android Enthusiasts Stack Exchange is a question and answer site for enthusiasts and power users of the Android operating system. It's 100% free, no registration required.

I've browsing through some jargon and cannot figure out what exactly the difference is between USIM and SIM. While not strictly an android question I figure all android phones are bound to have either one or the other so any clarification on this issue would be greatly appreciated.

share|improve this question

2 Answers 2

up vote 3 down vote accepted

SIM is a old guy, but USIM (card's name is UICC, USIM is logical module) is new designed specially for UMTS (3G) generation. While SIM can also be used to access 3G, USIM has extra advantages over SIM:

  • 3G Video Calls (not supported with SIM)

  • Higher Security: USIM introduces new algorithm to prevent unauthorized access to phone line. Plus, it encrypts your calls and internet traffic with stronger encryption keys. It stores contacts securely too.

  • Bigger and Improved phonebook: USIM allows you to store thousands of contacts (limit on SIM is 255). Each contact can now contain email id and more than one phone number.

  • USIM can run small applications like computer (SIM's analog is simple SIM menu which can't compute something by own other than communicating with carrier's server).

share|improve this answer

USIM could mean one of two things.

  1. Universal Subscriber Identity Module, which refers to the software that runs within the SIM card (technically now called a UICC (Universal Integrated Circuit Card) in UMTS parlance).
  2. uSIM could also mean microSIM (using u rather than μ), a SIM card format (technically known as 3FF) smaller than the miniSIM (2FF) used in most devices.
share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.