Cellular on Apple Watch Series 3 is for when you’re disconnected from your iPhone. With just your Apple Watch, you can make and receive calls, text messages (including iMessages), use apps, GPS, and do many of the things you can with your iPhone, except without being connected to it.

It’s great for when you, say, leave your iPhone at home, or your iPhone’s battery dies, or you just want to be “disconnected” from your phone for a while. I think more than anything, cellular on Apple Watch is a symbol of a growing importance of the role of the Apple Watch in daily life. I don’t think it’s going to eclipse the iPhone or smartphones in general any time soon, and I don’t think that is Apple’s intention. But Apple Watch is transforming what you can do when you don’t have access to your smartphone, and helping the Watch become yet another essential Apple product that you cannot live without.

After you’ve properly inserted the sim card into the slot, you’ll need to unlock the sim card on your smartphone by following the steps below.

• To begin, download and install the app on your phone that is connected to your smartphone. However, before you download the software, make sure it’s compatible with your device’s operating system.
• If you’ve confirmed that, go to the app store or play store and look for the app. Accept the application’s terms and conditions before moving on to the next stage of downloading it.
• You must first contact SpeedTalk mobile provider, which is normally the first step in the sim card activation process.
• You can use your smartwatch to call any mobile network service provider and request a new SIm Card connection. Then, on your mobile, copy and paste the service provider’s URL.
• After the browser has opened, continue by entering the Simcard’s information.
• Accept the terms and conditions after you’ve finished filling out the form.
• On the next tab, you can enter 6 OTP digits, which will be sent to your computer.
• Once you’ve entered the numbers, you’re good to go. Since some smartwatches need a restart, complete the process by restarting the device.

The only advantage of having a SIM inside a phone is so that you can make and receive calls on your watch without having your phone close by. Since the smartwatch will connect to your device VIA bluetooth you will get all the notifications as well as have the ability to answer a call as long as you are within the Bluetooth range.

In short, your smartwatch can do everything for the exception of taking calls when your out of Bluetooth range

An application installed on the SIMcard can intercept phone calls, SMS messages and track the geographical location. The latter is used often for location based services. The phonebook contacts can be stored on the SIM. In this case they can be tracked by an application on the SIM as well. One SIM manufacturer patented a built-in accelerometer, which made it possible to detect shaking, but I don’t think it was ever used.

Therefore, the SIM can track your location, your SMS and voice calls and the contacts (only if stored on the SIM). This doesn’t mean that the SIM reports this kind of information to a 3rd party. Only the operator shall have access to this information. In practice, the operator can track your calls, SMS and location even without asking the SIM.

An application installed on the SIMcard can intercept phone calls, SMS messages and track the geographical location. The latter is used often for location based services. The phonebook contacts can be stored on the SIM. In this case they can be tracked by an application on the SIM as well. One SIM manufacturer patented a built-in accelerometer, which made it possible to detect shaking, but I don’t think it was ever used.

Therefore, the SIM can track your location, your SMS and voice calls and the contacts (only if stored on the SIM). This doesn’t mean that the SIM reports this kind of information to a 3rd party. Only the operator shall have access to this information. In practice, the operator can track your calls, SMS and location even without asking the SIM.

One of the huge changes, that has been in the rumor mill for a while now, will be the ability to reprogram SIM cards over the air. i.e. imagine Apple installs its own SIM cards into the iPhone. When a user first turns on his phone he gets a ballot screen with a list of available carriers. The user can than select the carrier he wants and the SIM card is programmed accordingly. Then lets say the user goes on a trip. When he lands he selects a different carrier and the SIM gets reprogrammed. He gets to pay local rates instead of exorbitant roaming fees.

The only way to simulate that today is to (if your phone is unlocked) go to a store and buy the SIM card you want. The SIM cards described above will encourage greater competition amongst the carriers and provide for better user experiences like with SpeedTalk Mobile.

Only if The Device is Unlocked.