May 29, 2023
What is a SIM Card and What Does it Do?
Reading time: 8 minutes
We’ve all been there. Trying to install a SIM card into a new phone and wondering where a teen or tween is when you need one. We’ve probably all also wondered what a SIM card is, what it does, where it goes, and why it’s called a SIM card. In this post, PureTalk is going to take all the mystery out of all of this for you! For starters, SIM stands for subscriber identity module.
What are the functions of a SIM card?
Your SIM card (or subscriber identity module) stores the information that enables your wireless provider to recognize it. Otherwise you couldn’t text anyone or post anything. Your phone number is stored on your SIM card along with what are called “authorization keys.” These give your phone authorization to access the data, texting, and other services provided by your cell phone plan. Without a SIM card, your phone could not access and utilize your service provider and mobile network.
About your subscriber identity module
The data contained on a SIM card is what allows you to access H2O’s wireless network and utilize the features of your phone plan. It’s a small smart card that is shipped to you once your order is complete. Upon receipt of your mobile device, you insert the SIM card into your phone by popping out the SIM tray.
Where is the SIM tray located?
On iPhone, the SIM tray is located on either the right or left side of your phone. On an Android, it is located on the top, bottom, or side. It depends upon the model of your phone.
Installing a SIM card: Android
First, turn off your smartphone.
Now, take your phone out of its case if it’s in one, and then locate the SIM tray. It’ll be located on the top, bottom, or side, depending upon the model of your phone. Look for what appears to be a tiny hole or indentation. Once you’ve located the hole, you can use what’s called a micro SIM card ejector tool or a paperclip or pin to pop out the tray.
Press the SIM tool or paperclip into the small hole and the SIM tray panel will pop open. You don’t need to apply too much force; the tray will pop out easily.
Pull the SIM tray out of the smartphone and set it down.
Place the SIM card into the tray with the logo facing you. You really can’t insert it incorrectly as it only fits in one way.
Now, slide the SIM card into your phone. If it sticks or feels stuck, you probably don’t have the SIM card inserted properly. Pull the tray back out and place the SIM card in it again. Be sure it’s lying flat on the tray.
Once the SIM tray is reinserted into your phone, turn the power back on. You should see the power bars and your carrier information appear, and that’s it. You’re good to start making calls, sending texts, and posting to social media!
Installing a SIM card: iPhone
First, you need to turn off your smartphone. Press the Volume Up button and the top button on the right side of the phone until the words “Side to power off” appear on the screen. Slide the button to the right to shut down the phone.
Now, take your phone out of its case if it’s in one, and then locate the SIM tray. It’ll be located on the right or left side, depending upon the model of your phone. Look for what appears to be a tiny hole or indentation. Once you’ve located the hole, you can use what’s called a mini SIM card ejector tool or a paperclip or pin to pop out the tray.
Press the SIM tool or paperclip into the small hole and the SIM tray panel will pop open. You don’t need to apply too much force; the tray will pop out easily.
Pull the SIM tray out of the smartphone and set it down.
Place the SIM card into the tray with the bronze side facing you. You really can’t insert it incorrectly as it only fits in one way.
Now, slide the SIM card into your phone. If it sticks or feels stuck, you probably don’t have the SIM card inserted properly. Pull the tray back out and place the SIM card in it again. Be sure it’s lying flat on the tray.
Once the SIM tray is reinserted into your phone, turn the power back on. When you see the Apple logo on your screen, you’re good to go!
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So, we’ve covered the logistics of getting your SIM card into the SIM tray of your Android or iPhone, and getting the SIM tray reinserted so you can use your phone. See? It’s easy.
Now we want to introduce you to another kind of SIM, not to confuse you but because you might find it helpful. And don’t worry; it’s not confusing at all!
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Introducing the dual SIM phone
A dual SIM phone means you can put two SIM cards into one phone. This lets you manage two phone numbers, each with their own SIM card, on the same device. This is a neat feature if you want or need to have two phone numbers say, one for business use and one for personal use, and really don’t want to lug around two mobile devices. You can make calls from either phone number, and receive calls to either number. When making calls, your device will ask you which SIM card you want to use.
Now, let's get Geeky. Fun facts about SIM cards, dual SIM cards, unlocked phones, and international calling!
SIM cards aren’t “attached” to one phone. Except when they are
In general, you can remove your SIM card and put it in a new phone. You can even take someone else’s SIM card and put it in your phone. But sometimes, certain wireless carriers don’t permit this easy switching. And that’s why it’s important that we discuss locked and unlocked cell phones here.
About unlocked and locked phones
An unlocked phone is a phone that’s not associated with a specific carrier. One of the big benefits of mobile phones with this is that you can switch providers anytime you want – like when you find a plan that gives you all the bells and whistles the pricey wireless companies promise at half the price.
On the other hand, a locked phone is a device that’s tied to network carriers like AT&T, T-Mobile, or Verizon. These carriers “lock” your phone or mobile device on to their network to prevent you from using it on another one. (Like the better, less expensive one we just alluded to.)
How can I tell if my phone is locked or unlocked?
If you bought your phone from, say, AT&T, Verizon, or T-Mobile, and you have a monthly contract with them, your phone is most likely locked to their network. That’s just how they roll. If you bought your phone at Best Buy or at an Apple store or on Amazon, or someplace else entirely, it is most likely unlocked. The key phrase there is “most likely.” You can’t be certain until you check. Here’s how:
Check your settings: iPhone
One way to tell if your iPhone is unlocked is to go to Settings, then Cellular, then Cellular Data. If the words “Cellular Data Network” appear, it’s most likely – but not definitely – that your mobile phone really is unlocked. The pricey wireless providers really make you jump through hoops.
Check your settings: Android
One way to tell if your Android phone is unlocked is to go to Settings, then Connections, then Mobile Networks, then Network Operators. While in Network Operators, click on “search now.” If a variety of wireless carries names pop up, it’s most likely – but not definitely – that your phone is unlocked. Once again, pricey wireless providers will work your last nerve.
Contact your wireless provider
You can call the customer service department for your carrier and ask them to see if your phone is locked. You can also request that they unlock it. If you’d prefer to talk with someone in person, you can always visit one of your carrier’s stores and do the same thing. For those who are more tech savvy, it’s worth checking out your provider’s website to see if it offers information on how to unlock your phone. It’s important to note that, once you’ve requested your phone be unlocked, it can take your carrier 48 to 72 hours to do so. After that time has elapsed, call them to confirm that they have indeed unlocked your phone. You don’t want them conveniently – or inconveniently, for you – forgetting to do so.
Customer Service Numbers: AT&T: 1-800-331-0500; Boost Mobile: 1-833-502-6678; Cricket Wireless: 1-800-274-2538; Mint Mobile: 1-800-683-7392; Straight Talk: 1-877-430-2355; T-Mobile: 1-877-453-1304; and Verizon: 1-800-922-0204.
Try switching SIM cards
Another way to determine if your phone is locked or unlocked is by switching out the SIM card. Simply borrow one from a family member or friend whose service is provided by a carrier different from yours. Then shut down your phone. Remove it from the case, if it’s in one, and then remove your SIM card. Put in the SIM card you borrowed. Close the SIM tray. Turn your phone back on.
If you get a message requesting a code to unlock the SIM card, your phone is locked to your mobile network provider.
If you can use your phone like you always do, make and receive phone calls, send and receive text messages, your phone is unlocked.
SIM cards and travel
Whether you’re traveling within the continental United States or off on an international adventure, your SIM card functions as mobile communication in just the way we described it earlier: it allows your wireless provider to recognize your phone number so you can utilize your wireless provider’s network.
However, before traveling out of the United States, check into the roaming fees your provider charges. They can be pretty high which means you might want to obtain a SIM card once you’ve arrived at your destination. Doing so means you’ll pay the same prices as the local citizens do.
Now that you’re a SIM master, we’ll leave you with these final words of SIM wisdom
Remember: If you want to switch service providers for any reason at any time, it’s a whole lot easier – not to mention a whole lot less expensive – to unlock your phone than to go buy a new one. Think about it. Spend a few minutes getting your current device unlocked or plunk down $600 on a new one? We think spending a few minutes is the way to go and we think you’ll agree.
Remember: If you would like to sell your device there’s no wondering or hoping that the purchaser’s provider is compatible. When your device is unlocked, anyone can buy it and start using it immediately. No hassles. No down time. An unlocked phone makes that transaction nice and easy.
Remember: When traveling internationally or just making international calls, an unlocked phone allows you to use local SIM cards rather than paying the super high roaming fees many providers charge. If you make a lots of international calls on a regular basis, you can save hundreds of dollars each year.
For more ways to save hundreds of dollars, visit PureTalk now!
Posted 10 months ago