SIM in full form thanks to KBC4

"What is the full form of SIM?"

Amitabh Bachchan asked this question to a contestant and I felt embarrassed. Smart? Subscriber? Service?... Seriously, what is the full form? I was so clueless when I walked into the room while my mom-in-law was watching KBC4. She instantly guessed aloud "Subscriber"!

Like most of our parents, she was never keen on having a mobile phone when we surprised her with it on her birthday. She uses the gadget only for answering and making calls when absolutely necessary. Of course she has never removed the SIM card from its slot. And there she spoke confidently "Full form of SIM is obviously Subscriber". Damn, I felt so embarrassed and while I juggled between Smart and Subscriber. I confessed I really have no idea... an idea that can change your life especially when you are seated in front SIRji's dad in Kaun Banega Crorepati! And even though I was not out there, I was so uncomfortable about not knowing the answer.

If Alibaba existed today, he must have been so disappointed. All he knew was that "Khul Ja Sim Sim" opens the doors to a treasure worth Crores. But not when the treasure lies with Amitabh Bachchan!

The moment Big B popped the question, people started Googling "Full form of SIM", "SIM card", "SIM means", "SIM fullform", "full form of SIM card" and what not. In fact, as I write this post on the next morning of the SIM waala episode, Google is still buzzing with these search terms! So, I was not the only one clueless about it ;)

Today, I did enhance my knowledge by Googling it. The full form of the abbreviation SIM is Subscriber Identity Module. A SIM card securely stores the service-subscriber key (IMSI) used to identify a subscriber on a mobile phone. By the way, the first SIM card was made in 1991, I had my first mobile phone and first SIM card in 2002 and now I know what it means ;)

A few years ago, Webchutney (if I am not wrong) made this viral / ad for Airtel + KBC. They used the Khul Ja Sim Sim idea... if only they had educated us on the full form of AAJ KA SIM then!!!


  1. I knew the answer. I am not that intelligent. But I work for a telecommunications company.

    However, I have a question. Did any word in that question was associated with cell phone? If it was just “What is the full form of SIM”, the right answer is not necessarily Subscriber Identity Module. The person answering cannot simply assume that the question is related to cell phone SIM. It can be any of the more than 250 (official) acronyms. For example:

    Serving in Mission (an international Christian mission)
    Singapore Institute of Management
    Security Information Management
    Society for Information Management
    Space Interferometry Mission
    Social Influence Marketing

  2. I had a topic on SIM when I was doing engineering.. Also a question was asked on SIM for 12 marks with diagram :P


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