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The SIM card is what connects the phone to the GSM network (in full, Global System for Mobile Communications: global system for mobile communications). After inserting the SIM card into an unlocked (network unlocked) phone, you will be able to use carrier services on the phone. Likewise, if your phone is unlocked, you can use SIMs of many different carriers and this is extremely useful when we travel. In the process of swapping SIM cards between multiple phones, you need to make sure that the new phone can use the SIM card from the carrier you use.
Steps
Contacts backup
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Open the contacts in the phone you are using. You can back up your contacts to a SIM card before you swap, but it’s not the most convenient way. This method should only apply to regular phones, but if you are using a smartphone, your contacts are usually synced with your Google account or Apple ID.
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Open the menu and select “Export” or an option with similar functionality.
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Set up the SIM card as the destination for the phone numbers to be exported.
Prepare to swap
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Check the SIM card size on each phone. SIM cards usually come in three main sizes, but your phone can use a SIM in a different size. This is especially true if these devices are manufactured within a few years of each other. Some carriers offer a free SIM card exchange service with the right size for customers.
- You can use a special SIM cutter to cut the SIM smaller, or ask your carrier to exchange a different SIM card with a more suitable size.
- For SIM cards that are smaller than the slot, we can insert them into the sim switch frame and use it normally.
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Get a new SIM card if you change carriers. Every time you change mobile networks, you need to buy a new SIM card. After you sign up for the service and provide your carrier information, you’ll receive a new SIM card. If you change mobile networks and need a SIM card of a different size, contact customer service (there may be no charge, depending on carrier policy). [1] X Research Source
- Today, some carriers implement the CDMA standard (in full, Code Division Multiple Access, this technology does not use SIM cards) to replace the GSM standard. However, most 4G networks require the use of a SIM card. A good example is Verizon Wireless – a wireless network provider in the US. Their products use CDMA standard, but 4G LTE service is GSM network, so users still have to use SIM card to access 4G network. In Vietnam, CDMA technology is not as popular as GSM.
Swap SIM card to another phone
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Open the back cover of the old phone. If your phone has a protective cover, you need to open the cover to get the SIM card.
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Search for SIM cards. Depending on the phone model, the SIM card is located in different locations:
- Check the SIM tray. Many smartphones today design a SIM tray located on the side of the phone. We need to use a SIM tray opener or a straight paper clip to poke the small hole next to the SIM tray to open it.
- Check the back of the battery. You need to remove the battery part because the SIM card is usually inserted behind the phone battery.
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Remove the SIM from the phone. Once the SIM card is located, proceed to remove it from the phone.
- For phones that use a SIM slot, use a SIM poke tool or a paper clip to pop the slot out. Then pull it out and remove the SIM card from the slot.
- If the SIM card is behind the phone battery, you can slide or push the SIM card down so it pops out, depending on your phone’s build.
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Insert the SIM card into the new phone. To insert the SIM card, do the reverse of the process of taking out the SIM card. [2] X Research Source
Activate new phone
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Start the activation process for your new phone (if applicable). If you’re going through the activation process for an “unboxed” smartphone, you’ll have to go through the initial setup steps. During this process, the SIM card will usually be activated automatically on the new phone.
- Learn how to use your Android phone for activation.
- Read more about Activating iPhone for instructions on how to activate your iPhone during the initial setup process.
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Insert the SIM card and then power on the phone. After the phone has turned on, especially if you have just inserted another SIM, you often have to wait a while for the service to be activated. Just insert the SIM card, activate the phone if it is powered off and wait until it connects. You’ll see a column (usually with the carrier’s name) appear in the notification area on the screen.
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Contact your carrier if you cannot connect. If your SIM card still cannot work on your new phone, you need to contact your service provider. Since your phone can’t connect, you may have to borrow someone else’s phone to call the operator or bring your new phone to your carrier’s support center to get it activated.
X
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 13,442 times.
The SIM card is what connects the phone to the GSM network (in full, Global System for Mobile Communications: global system for mobile communications). After inserting the SIM card into an unlocked (network unlocked) phone, you will be able to use carrier services on the phone. Likewise, if your phone is unlocked, you can use SIMs of many different carriers and this is extremely useful when we travel. In the process of swapping SIM cards between multiple phones, you need to make sure that the new phone can use the SIM card from the carrier you use.
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