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SIM cards believe it or not come in 4 sizes  SIM Card  - Not used any more; about the size of a credit card. Mini-SIM Card  - The most common in the previous generation, it's what most people would call a SIM card. Micro-SIM Card  - The now standard for smartphones; much smaller; just about contains the contacts on the back. Nano-SIM Card  - I've only seen it used so far in Apple iPhones, but I'm sure it will catch on; this is literally just the contacts. Step 1: Get a Sim Card + Scissors No matter what size, I think most of you will have the Mini SIM Card and will want to cut that down to a micro-SIM card but a Nano SIM is also possible. Step 2: Download This Page and Print This is a link to a page  from a UK mobile network that gives you the guide on how to cut your SIM down to size. Step 3: Mark Up and Start Cutting Obviously be careful when cutting, you will want to follow the guide exactly. You will see the actual memory of t...

Given the security situation in the country (and also reported abuse of communication systems and channels), everyone must be cautious . It is possibility that someone might have got a SIM (Subscriber Identity Module) against your ID (CINC). I suggest you check and find out the total number of SIM(s) registered against their respective CNIC number with each mobile operator. Pakistan Telecommunication Authority (PTA) has developed a SIM (Subscriber Identity Module) information system to address associated risks on security and to ensure subscription regulations in cellular sector. http://www.pta.gov.pk/668/index.html