What Are Calling Cards And Sim Cards

Subscriber Identity Module (SIM): Subscriber Identity Module (SIM) is removable SIM card

, used to identify mobile subscriber on mobile telephony devices. One can change SIM cards from one device to others device.

A SIM Cards has its unique serial number, internationally unique number of the mobile user (IMSI), temporary information related to the local network, security authentication and ciphering information, a list of the services the user has access to and two passwords.

SIM Cards have three size cards. It has first size cards of credit cards. With reduced of mobile phone size, sim cards also converted to smaller and mini SIM Cards. Mini cards have same size as same thickness but reduced length and width to 25mm*15mm.

Calling Cards: This is similar sized prepaid credit cards, to redeem cellular and telephony phone minutes. Calling cards are manufactured with phone carrier, third party manufacturer. Calling cards are two type cards: pay as you go, long distance landing plan.

Under pay as you go cards do not require monthly fee, instead, calling cards are purchased and registered with carrier. Carrier adds minutes-credits to phone of customer, one can purchased more calling cards. This is popular in teenagers who dont have credit cards and use to phone in little use.

Other type prepaid calling cards is used for long distance landline cards. In this, users call to 800 number, registered him and get PIN. Access number and PIN are prior to dialing a phone number. The carrier detects and put minutes in users account.

Calling Cards and SIM Cards both are different and cannot be used and called for one place. SIM cards have functionality beyond the users where else calling cards came to related to users uses. User can have multiple calling cards with different balances for long distance landline and pay as you.

by: Andrw Clark

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