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  • Call your current carrier to ensure your phone is not locked to another carrier, or help to get it unlocked.  
  • Purchase a SIM kit from the carrier that’s right for you.
  • Follow the SIM kit instructions to activate the phone.
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Main Results
  1. Mint Mobile - 10GB Phone Plan - 3 Months of Wireless Service - Front_Zoom
    Your price for this item is $60.00
  2. Mint Mobile - 4GB Phone Plan - 3 Months of Wireless Service - Front_Zoom
    Your price for this item is $45.00
  3. Ultra Mobile - Prepaid SIM Card - Front_Zoom
    Your price for this item is $2.00
  4. Mint Mobile - Unlimited Phone Plan - 3 Months of Wireless Service - Front_Zoom
    Your price for this item is $90.00
  5. Simple Mobile - Keep Your Own Phone Sim Card Kit - Front_Zoom
    Your price for this item is $1.00
  6. Verizon - SIM Starter Kit - Front_Zoom
    Your price for this item is $9.95
  7. Google - Fi SIM Card Kit - Front_Zoom
    Your price for this item is $9.99
  8. Mint Mobile - Prepaid SIM Card Starter Kit - Front_Zoom
    Your price for this item is $2.00
  9. AT&T - SIM Kit - Front_Zoom
    Your price for this item is $9.99
  10. advertisement
  11. Boost Mobile 3 Months 5GB Plan SIM Card Kit - Front_Zoom
    Your price for this item is $29.99
    Save $15
    The previous price was $44.99
  12. Ting Mobile - Sim Card Kit w/$30 service credit included - Front_Zoom
    Your price for this item is $0.99
    Save $9
    The previous price was $9.99
  13. TracFone - Keep Your Own Phone Sim Card Kit - Front_Zoom
    Your price for this item is $1.00
  14. H2O Wireless - Smart SIM Starter Kit 3-in-1 SIM Card for Unlocked Phones - Yellow - Front_Zoom
    Your price for this item is $1.00
  15. Mint Mobile - 10GB Phone Plan - 12 Months of Wireless Service - Front_Zoom
    Your price for this item is $240.00
  16. Ultra Mobile 1 Month - Unlimited Phone Plan with (Micro/Mini/Nano) Sim Kit - Front_Zoom

    Ultra Mobile 1 Month - Unlimited Phone Plan with (Micro/Mini/Nano) Sim Kit

    Model: UM001090
    SKU: 6481914

    Not Yet Reviewed

    Your price for this item is $25.00
    Save $24
    The previous price was $49.00
  17. Cricket Wireless - 3-in-1 SIM Card Activation Kit - Front_Zoom
    Your price for this item is $9.99
  18. Google - Fi Simply Unlimited SIM Card Kit - Front_Zoom
    Your price for this item is $60.00
  19. Total Wireless - Keep Your Own Phone SIM - Front_Zoom
    Your price for this item is $1.00
  20. Boost Mobile 3 Months Unlimited Plan SIM Card Kit - Front_Zoom
    Your price for this item is $89.99
  21. Net10 - Keep Your Own Phone Sim Card Kit - Front_Zoom
    Your price for this item is $1.00
  22. H2O Wireless - Smart SIM Traveler Starter Kit 3-in-1 SIM Card for Unlocked Phones - Yellow - Front_Zoom
    Your price for this item is $1.00
  23. Boost Mobile 1 Month 15GB Plan SIM Card Kit - Front_Zoom

    Boost Mobile 1 Month 15GB Plan SIM Card Kit

    Model: BMDPDSHTSIMENR02
    SKU: 6484739

    Not Yet Reviewed

    Your price for this item is $29.99
  24. Ultra Mobile 3 Month - 6GB Phone Plan with (Micro/Mini/Nano) Sim Kit - Front_Zoom
    Your price for this item is $84.00
  25. FreedomPop - Unlimited WiFi Calling, 10 Texts, 25MB/mo - Monthly SIM - Front_Zoom
    Your price for this item is $9.99

Buy SIM cards.

What is a SIM card?

A SIM card lives inside your cell phone and is essentially your phone’s ID. It stores contacts and other data, and your phone won’t work without it. A SIM card works by connecting with your mobile phone and your carrier’s cell towers, so the two can communicate. When you upgrade your phone, you bring your SIM card with you to keep your phone number, data plans and more; but since most SIM cards are designed to work only with certain brands and carriers, they won’t fit just any phone. Whether you’re shopping for a new smartphone or refurbished cell phones, check out Best Buy for great deals every day.

What are the types of SIM cards?

From an AT&T SIM card, T-Mobile SIM card, or Verizon SIM card to other prepaid SIM cards, they usually come in one of three popular sizes: Regular SIM cards, micro SIM cards and nano SIM cards. A nano SIM card offers the same features as larger cards do, but in a more compact package. Many phones are equipped with cutouts for all three sizes, so you can decide which version you want. If your phone fits only one type of SIM card, you can try using an adapter, which allows nano SIM cards to fit into micro SIM or regular SIM slots.

How do I use an unlocked phone?

If you love to travel and want an international SIM card, or you simply don’t want to commit to a carrier, an unlocked phone might be right for you. Unlocked phones are packed with all the features you want, plus you can move from carrier to carrier whenever you like, making it easier to transition internationally. Unlocked phones use an interchangeable SIM card that can connect to multiple Global System for Mobile (GSM) networks, like Sprint and Verizon in the United States. Prepaid phones work in a similar way, in that you can avoid an expensive wireless plan by paying month-to-month, but they are compatible with only one specific carrier.

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