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 Brand NEW SIMPLE MOBILE Micro SIM CARD KIT FOR iPhone4 US $1.99 
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 5X Sim Card Tray Eject Pin Key Tool For iPhone 3G 3GS 2G 4G US $.99
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 2 In 1 USB 2.0 Micro SD TF + SIM Card Reader GSM /CDMA US $2.99
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 100 Simple Mobile 4g SIM Card unlimited talk text web US $24.99
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 Brand New T-Mobile Sim Card! US $8.99
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 All In1 USB 2.0 phone SIM Card & MICRO SD MMC Card Read US $2.99
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 HKD600 Prepaid Micro SIM Card 3G Roaming Visit Hong Kong for iPhone 4 4S ZVOT999 US $49.59
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 BLACKBERRY WORLD EDITION. (GSM UNLOCKED) VERIZON + INTERNATIONAL SIM CARDS US $.99
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A Sim Card is a little,thin rectangular card in all GSM cell phones.It ca be found in the battery compartment,behind the battery on most models.A sim card is your phones' Id.It stores the number that others dial to reach you,as it stores it.You must have a sim card to use your cell phone,if its is removed the cell phone stops working, and your number will no longer be stored.
Subscriber Identity Module (Sim) card is kinda like a memory chip from your PC. You can place your sim card in anothers phone and all charges or debit of the minutes by your cell service provider will be charged to YOUR account ,not the phones owner.Its really not a big techy thing to swap these out. Using an unlocked phone ,you can purchase a local (if traveling abroad)pre-paid sim card giving you a local number wherever you go.That will save you from paying international roaming charges to your service provider back home.