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This Is Why Your Smartphone Is Able To Make Emergency Calls Without A SIM

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This Is Why Your Smartphone Is Able To Make Emergency Calls Without A SIM 1
If you’re an active mobile phone user, you will notice that your phone can actually make emergency calls without any SIM. I know you must be wondering how this is possible since there’s no mobile number.

Let me explain how your SIM works.

SIM as you ought to know stands for Subscriber Identification Module and it helps to identify the cell service subscriber that is trying to connect to the network. Every user has their own SIM, so network providers can direct calls to that specific phone and track usage (and charges) individually. The identifying number of a SIM card is called an ICCID.

This Is Why Your Smartphone Is Able To Make Emergency Calls Without A SIM 2

 The IMEI is like the DNA of a phone; all phones can be identified just with their IMEI.

This is a logical example of what happens when you call your friend with a SIM card:

 Michael’s phone 📱 to cell tower 🗼 : My IMEI is 123 and my ICCID is 456. I want to call +234-123–456–7890, please!

 Cell tower: IMEI is 123, ICCID is 456; 456 is Michael’s account. I’m from Michael’s cell phone carrier and provide him with service, Michael has 100 minutes left in account, connecting call.

 Michael : Thanks! 

Now This is what happens when you try to call a friend without a SIM card:

 Ade’s phone to nearby cell towers: My IMEI is 123 and I don’t have any SIM card. Please let me call +234-123–456–7890, please!

 Cell Tower🗼 : Who’s this one again😣?  Are you normal? You didn’t even subscribe to any services, or even my own network ; why should I give them to you for free? Gerrarahia Mehnn!

Ade : Chai!

 That sounds quite interesting, right? In the first instance, the cell tower allowed Michael to place the call because it knew who he was and that he was paying for it, but in the second, Ade was unsuccessful in placing the call because the tower had no idea who it was and didn’t want him using the service for free. It’s like allowing a total stranger into your home.

Now what if the person on the other side of the door was involved in a terrible accident , on fire, or getting robbed ? What would the cell tower do?

 Musa calling 911 or 112 with SIM card:

 Musa’s phone to cell tower: Help Musa is dying! My IMEI is 123, my ICCID is 456, my latest location is 123 Musa’s Place, please connect to emergency services!

 Cell tower: I can see Musa’s info with ICCID #456 and your latitude and longitude coordinates, connecting to Emergency Number!

 Musa : Help, I’m on fire!

 As you can see, 911 was able to receive information about Musa thanks to his ICCID and GPS coordinates.

 Rochas calling 911 without a SIM card:

 Rochas’ phone to all nearby cell towers: Hello, please anybody around , help! Rochas is on fire!

 Nearby cell tower: I’ll take the call! I really don’t care who you are, but I’m willing to help! Your IMEI is 123, meaning that you’re a Black variant of the Tecno Phantom 8, and your location is 123 Rochas’ Place! Connecting to Emergency number because I’m nice and I don’t want you to die yet !

 Rochas : Help oh !

Rochas still got the help he needed, even with no SIM card. The emergency services would’ve been unable to receive much detailed personal information on John, but they knew his location and would be able to get there quick.

 To round it up, cell phone towers are a lot more like paranoid kids staying at home for the first time. They won’t let you in if you don’t know their “secret password” lol, but are kindhearted enough to accept your pleas to help no matter who you are. So next time you’re in an emergency, don’t let “no service” fool you.  

Michael Ajah is a Computer Science Student of The University of Port Harcourt and a Chelsea Fan. He loves RnB and a little mix of Trap Music. An awesome tech reviewer and analyst. Email - [email protected]

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Tecno Camon i4 – Full Specs And Cheapest Price

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Tecno Camon i4

Tecno just launched a new device into the Camon lineup the Tecno Camon i4 and the device comes with very impressive specifications and a very good price in this post I’ll be looking at the specs of the Tecno Camon i4.

Tecno Camon i4

The TECNO CAMON i4 ships with a mid-range MediaTek Helio A22 processor for the 2GB / 3GB RAM version and a MediaTek Helio P22 processor for the 4GB RAM version and 32GB / 64GB  of internal storage.

The Camon i4 runs on Android 9.0 with HiOS 4.6 on top, keeping the lights on is a 3500mAh battery with support for fast charging.

I do hope the fast charging isn’t the same as the Xcharge on the Tecno Spark 2 because that means it’s not actually fast charge. Tecno deserves this shirt on that note

Tecno Camon i4 - Full Specs And Cheapest Price 3

Design And Display

I’m quite impressed with the fact that Tecno decided to go with the dewdrop notch on this device instead of that lousy Apple-like rectangular notch. This one is quite similar to the one on the Samsung M20 and I’d say it’s not bad at all considering the fact that they’ve been giving us phones with notches since the release of the Camon 11 Pro.

Tecno Camon i4 - Full Specs And Cheapest Price 4

You basically get a 6.2-inch IPS Capacitive display with an 81.3% screen-to-body ratio. It’s not something you would call totally bezelless as there’s still as small chin below the device.

Tecno Camon i4

Camera 

The Camera is one of the selling points of this device as the smartphone’s triple camera has a 13MP, 8MP, and 2MP lens combination, which means you would get an impressive performance while taking photos and recording videos at 1080p. The secondary camera at the front is a 16-MP lens and great for selfies. You also get better quality when calling someone via video so cheers to the Snapchat and Instagram Slay Queens.

Tecno Camon i4 - Full Specs And Cheapest Price 5

Software And Hardware

In the specifications department, I’ll give Tecno a B+ on this. The Camon i4 comes with a MediaTek Helio A22 chipset clocked at 2-GHz combined with a Cortex A53 quad-core processor, which takes charge of the Camon i4’s performance. In the graphics department, you get A PowerVR GE8300 GPU to take care of the graphics. There’s also a 4GB variant that comes with a higher Helio P22 Chipset.

Storage

The Camon i4 comes with 32GB of internal storage that can be expanded to 256GB via a memory card. There are 2GB, 3GB, and 4GB variants.

Network And Connectivity

The new Tecno Camon i4 offers a variety of options for easy connectivity, which includes 4G with VoLTE (Voice Over LTE), Wi-Fi, mobile hotspot, micro-USB, GPS, Bluetooth, etc.

Battery

The Tecno Camon i4 ships with a 3500 mAh non-removable lithium-ion battery which means you get a battery that’s enough to last you 10 hours when used actively and about 36 hours when on standby

TECNO Camon i4 Specifications

  • Display: 6.217-inch (1520 x 720) pixels) HD+ display
  • Chipset: 2GHz Quad-Core MediaTek Helio A22 12nm processor / 2GHz Octa-Core MediaTek Helio P22 (MT6762) 12nm processor
  • RAM+ROM: 2GB / 3GB RAM with 32GB storage, 4GB RAM with 64GB storage, expandable memory up to 256GB with microSD
  • Operating System: HiOS 4.6 based on Android 9.0 (Pie)
  • SIM: Dual SIM (nano + nano + microSD)
  • Camera: 13MP + 2MP rear camera, 8MP 120° ultra-wide camera, quad LED flash; 16MP front-facing camera
  • Sensor: Fingerprint sensor, AI Face Unlock
  • Dimensions: 156.9×75.8×7.96mm
  • Network: Dual 4G VoLTE, Wi-Fi 802.11 b/g/n, Bluetooth, GPS
  • Battery :3500mAh battery

Pricing

The price of the Tecno Camon i4 for the 2GB + 32GB variant is N49,000 ($140)

The price of the Tecno Camon i4 for the 3GB + 32GB variant is N55,000 ($154)

The price of the Tecno Camon i4 for the 2GB + 32GB variant is N63,000 ($175)

So what do you think? Is this your next smartphone

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How Multiple Cameras Work On Android And iOS Smartphones

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How Multiple Cameras Work On Android And iOS Smartphones 6

How multiple cameras work on smartphones have always been a question on the minds of most people and 2019 is the year of multiple cameras and many if not all smartphone brands have released phones with multiple cameras. You’ve probably seen the Nokia 9 Pureview with 5 cameras and the Huawei P30 Pro that comes with 4 cameras  (40MP + 20MP +12MP +TOF Camera) and 50x optical zoom.

https://www.gadgetsnow.com/mobile-phones/Huawei-P30-Pro

 Huawei P30 Pro

How Multiple Cameras Work

These two devices come with crazy specifications but I won’t go into that right now, maybe in another post.

However, have you ever tried covering the main camera of your device with a dual camera?

If you haven’t, try doing that right now.

You’ll notice you are actually blocking the whole camera. That leaves the question – What do the secondary cameras do and how do they work.

How Multiple Cameras Work On Android And iOS Smartphones 7

How Multiple Cameras Work

Now I want you to understand this. Most OEMs have other uses of their secondary camera other than the ones I’m going to mention below. These are just the basic functions of the secondary camera.

The secondary camera improves the overall clarity of the image with the help of a “Monochrome” feature. The secondary camera only records the black and white version of the image. With the help of the Monochrome sensor, the primary camera measures how much light is coming from the point of focus.

Previously (with the exception of the Google Pixel 3), the primary camera in smartphones normally handled the measurement so there was a very high possibility of losing some detail while measuring light intensity since it would still need to work on the color filtering.

So this extra burden is handled by the second camera which takes care of that area. Combining the monochrome image which has detailed information about the light and sharpness with the colored image that was captured by the primary camera will produce a rich and detailed image.

In some phones, the secondary camera acts as the zoom lens. Huawei uses their cameras on the P30 Pro a bit differently but going into the entire details might end up making this post a bit lengthy and a bit boring for people who aren’t hardcore techies so I’d try to keep this balanced. However, if you’d like to see that in another post do let me know in the comments.

So that’s basically how multiple cameras work on smartphones

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