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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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  1. Mint Mobile - Unlimited Phone Plan - 3 Months of Wireless Service - Front_Zoom

    Mint Mobile - Unlimited Phone Plan - 3 Months of Wireless Service

    Minimum Contract Period:
    3 months
    Model: MINT-UNLIMITED-03
    SKU: 6434629
    Your price for this item is $90.00
  2. Simple Mobile - Keep Your Own Phone Sim Card Kit - Multi - Front_Zoom

    Simple Mobile - Keep Your Own Phone Sim Card Kit - Multi

    Model: SMATKTMT5SAPOS-TRI1
    SKU: 6444056
    Your price for this item is $1.00
  3. Google - Fi Simply Unlimited SIM Kit - Front_Zoom

    Google - Fi Simply Unlimited SIM Kit

    Model: PCNV00040RE
    SKU: 6507757
    Your price for this item is $50.00
  4. Ultra Mobile - Prepaid SIM Card - Front_Zoom

    Ultra Mobile - Prepaid SIM Card

    Your price for this item is $2.00
  5. H2O Wireless - Smart SIM Traveler Starter Kit 3-in-1 SIM Card for Unlocked Phones - Yellow - Front_Zoom

    H2O Wireless - Smart SIM Traveler Starter Kit 3-in-1 SIM Card for Unlocked Phones - Yellow

    Model: H2O WIRELESS UNIVERSAL SIMCARD
    SKU: 6419068
    Your price for this item is $1.00
  6. Cricket Wireless - 3-in-1 SIM Card Activation Kit - Front_Zoom

    Cricket Wireless - 3-in-1 SIM Card Activation Kit

    Model: CRICKET NR BYOD SIM KIT SMALL
    SKU: 6129015
    Your price for this item is $9.99
  7. Ting Mobile - Sim Card Kit w/$30 service credit included - Front_Zoom

    Ting Mobile - Sim Card Kit w/$30 service credit included

    Model: STRK-X3PACKRETAIL30
    SKU: 6406986
    Your price for this item is $0.99
    Save $9
    The previous price was $9.99
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  9. Boost Mobile - 1 Month 15GB Plan SIM Card Kit - Front_Zoom

    Boost Mobile - 1 Month 15GB Plan SIM Card Kit

    Model: BMDPDSHTSIMENR02
    SKU: 6484739
    Your price for this item is $29.99
  10. Boost Mobile - 1 Month 5GB Plan SIM Card Kit - Front_Zoom

    Boost Mobile - 1 Month 5GB Plan SIM Card Kit

    Your price for this item is $19.99
  11. Mint Mobile - 3-Month Unlimited Prepaid Plan (Instant Delivery) [Digital] - Front_Zoom

    Mint Mobile - 3-Month Unlimited Prepaid Plan (Instant Delivery) [Digital]

    Model: Mint Mobile eSIM DDP.com 90
    SKU: 6523651
    Your price for this item is $90.00
  12. Visible - One Month Prepaid Premium Unlimited Data Plan & SIM Kit - Front_Zoom

    Visible - One Month Prepaid Premium Unlimited Data Plan & SIM Kit

    Model: DFILLSIM-CDVSP30-A
    SKU: 6514275
    Your price for this item is $45.00
  13. Mint Mobile - 3-Month 4GB eSIM Prepaid Plan (Instant Delivery) [Digital] - Front_Zoom

    Mint Mobile - 3-Month 4GB eSIM Prepaid Plan (Instant Delivery) [Digital]

    Model: Mint Mobile eSIM DDP.com 45
    SKU: 6523654
    Your price for this item is $45.00
  14. Mint Mobile - 15GB Phone Plan - 3 Months of Wireless Service - Front_Zoom

    Mint Mobile - 15GB Phone Plan - 3 Months of Wireless Service

    Your price for this item is $75.00
  15. Verizon LTE SIM Card for DroneMobile X1 - White - Left_Zoom

    Verizon LTE SIM Card for DroneMobile X1 - White

    Your price for this item is $19.99
  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

    Your price for this item is $49.00
  17. Boost Mobile - 3 Months 15GB Plan SIM Card Kit - Front_Zoom

    Boost Mobile - 3 Months 15GB Plan SIM Card Kit

    Your price for this item is $74.99

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.

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.

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.

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