What is 4FF and 3FF in SIM? 0

3FF is also called Microsim. It is most commonly used in mobile devices. The microsim was introduced in 2003. This form is called Third Form factor or 3FF.

Various SIM cards are,

First Form – Credit Card Sized cards

Second Form – Stamp Sized SIM cards

Third Form – microSIM

Now ETSI accepted new standard named nano sim which is also called 4FF or forth Form Factor. 3FF has a dimension of 12mm x 15mm.

Various Sim sizes and dimensions are showed in the image shown above.

Mobile Phone makers for a new,smaller SIM card Standard 0

Cell phone manufacturers decided to adopt a new standard for smaller SIM cards. Nokia Oyj and Apple presented competing proposals. Apple's proposal was selected for the novel SIM standard. The new standard was selected by ETSI(European Telecommunications Standards Institute). 




This standard is compatible with the existing SIM card design too. The new SIM size will be 40% smaller than existing version. 

Alert:Internet may shutdown on July 9 0

While searching using Google, if you get a message like "Your computer appears to be infected", dont get frightened. Google has issued this warning to millions of users which also says that they could lose internet connectivity after july 9. This is due to a computer virus or a malware named DNSChanger. Google displays the warning message to help users whose systems are infected with the above malware. Most people are unaware about the situation. So before clicking on links make sure it is secure. Do not try to open suspicious web pages.

How DNSChanger works?


DNSChanger is a Trojan horse which is assumed to be infected about 4 million Computers globally. Out of this 500,000 is in USA and 20,000 is in India. This malware will change the DNS server settings to some rogue DNS network created by malware developers.
The concept behind this malware is to interfere IP address lookup and give a false IP address to computer. The result is that, when you try to open your favorite website, it will be redirected to some fake webpage.

This is really a threat to internet users. So be carefull and if you are infected, do necessary steps to change or restore DNS setting. I will explain step by step procedure in my next post.