Reasons phones now have different sim Card Sizes



If you’re getting a new smartphone, you’ll need to make sure you have a SIM card of the right size to fit in your phone.
SIM cards come in three different sizes: Standard SIM, Micro SIM and Nano SIM. The right size of SIM card to fit in your handset will depend on the manufacturer and model of your smartphone.
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Standard SIM 2FF or “Mini SIM”
The mini-SIM (or 2FF) card has the same contact arrangement as the full-size SIM card and is normally supplied within a full-size card carrier, attached by a number of linking pieces. This arrangement (defined in ISO/IEC 7810 as ID-1/000) lets such a card be used in a device that requires a full-size card – or in a device that requires a mini-SIM card, after breaking the linking pieces. As the full-size SIM is no longer used, some suppliers refer to the mini-SIM as a “standard SIM” or “regular SIM”.
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Micro-SIM
The micro-SIM (or 3FF) card has the same thickness and contact arrangements, but reduced length and width as shown in the photo.
The micro-SIM was introduced by the European Telecommunications Standards Institute (ETSI) along with SCP, 3GPP (UTRAN/GERAN), 3GPP2 (CDMA2000), ARIB, GSM Association (GSMA SCaG and GSMNA), GlobalPlatform, Liberty Alliance, and the Open Mobile Alliance (OMA) for the purpose of fitting into devices too small for a mini-SIM card.
The form factor was mentioned in the December 1998 3GPP SMG9 UMTS Working Party, which is the standards-setting body for GSM SIM cards, and the form factor was agreed upon in late 2003
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Nano-SIM
The nano-SIM (or 4FF) card was introduced on 11 October 2012, when mobile service providers in various countries started to supply it for phones that supported the format. The nano-SIM measures 12.3 × 8.8 × 0.67 mm and reduces the previous format to the contact area while maintaining the existing contact arrangements. A small rim of isolating material is left around the contact area to avoid short circuits with the socket. The nano-SIM is 0.67 mm thick, compared to the 0.76 mm of its predecessor. 4FF can be put into adapters for use with devices designed for 2FF or 3FF SIMs, and is made thinner for that purpose, but many phone companies do not recommend this.
The iPhone 5, released in September 2012, was the first device to use a nano-SIM card, followed by other handsets.
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SIM Type Alternative Name Length (mm) Width (mm) Height (mm)
Standard SIM 2FF or “Mini SIM” 25.00 15.00 0.76
Micro SIM 3FF 15.00 12.00 0.76
Nano SIM 4FF 12.30 8.80 0.67
Comparison of SIM card dimensions. Please note: Nano SIMs are 0.09mm thinner than Standard SIM and Micro SIM.
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However today, most new smartphones typically require either a Micro SIM or Nano SIM:


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