Business Tips, Mobiles

What Is Dual Sim, and Do I Need One?

White hand holding an iPhone

If you have separate business and personal phones and are tired of carrying them both around, this may just be for you.

Tired of having two phones on you all the time? Think it would be easier to just have the one but you still want to keep your business and personal lives separate? Dual Sim Smartphones could be your answer. 

But first, What is Dual Sim

Dual SIM is a feature of some smartphones that allows them to hold and use two different SIM cards, simultaneously.

It is a smartphone or phone that can hold two different SIM cards at the same time is called a Dual SIM device. Having two SIM cards means that a Dual SIM smartphone can use either of the two SIMS to initiate or to receive phone calls.

And, Why would you want that? 

You might want to have your personal phone number and your work number on the same device. This saves you carrying around multiple handsets, potentially having multiple chargers to think about and maintaining more than one device.

For freelancers too, a these phones can come in handy as you can handle multiple jobs without having to juggle multiple devices.

Oh and also, a dual SIM phone comes in handy for saving on your phone bill as you could spit the costs of texts, minutes and data (if you really wanted). 

Do I need a special phone? 

If you want more than one phone number on the same device, or multiple networks on that single handset, you’ll need a dual SIM phone. The most basic part of a these phone, that other handsets don’t have, is a tray that can load in more than one SIM. But, with eSIM becoming more common you may find dual phone numbers on one device without loading in two SIMs.

Dual Sim Implementation

There are a couple of types of Dual SIM implementations that work differently, and some are better than others. The types of implementations available are:

Dual SIM Single Standby (Passive) –  A Passive phone is capable of using two different SIM cards, but only one of them can be active at any time.

That means that when one SIM card works, the other is unreachable. 

To use the second SIM card, you need to activate it manually, and the first SIM deactivated when you do that. 

However, this is the worst implementation of the Dual SIM technology, and you do not find this implementation in smartphones, just older mobile phones.

Dual SIM Dual Active – Active smartphones have both their SIM cards permanently active and, when you are having a conversation on one of them, the other still works and receives calls, messages or data. 

This implementation allows you to make phone calls from both of the SIM cards inside your smartphone. 

t can also receive calls on either of the two SIM cards, at the same time.

For instance, if you have a call on the first SIM and you are getting another call on the second SIM, you are notified about it. 

The disadvantage of Active phones is that these devices have two radio transceivers, one for each SIM card. It means that they consume more battery than regular Single SIM smartphones and they are more expensive to manufacture, leading to a higher price. 

It is also the reason why it is challenging to find smartphones with this implementation.


The eSIM is a built-in SIM card. Because it’s incorporated in your smartphone, you no longer need a plastic SIM card. You can have multiple phone plans on the eSIM, so you use your smartphone as a dual SIM device. To use eSIM, both your smartphone and your provider must support eSIM. Currently, there aren’t many providers that offer eSIM, so check this in advance.

In the UK, you can get an eSIM from EE, O2 or Vodafone for use in your iPhone, Samsung Galaxy or Google Pixel phone. eSIM or embedded SIM technology is now available in the latest flagship smartphones from Apple, Samsung and Google. On devices like the iPhone 12 and Galaxy S21, you can download an eSIM onto your phone.

What smartphones are dual sim? 

Samsung Galaxy S21 Ultra 

Oppo Find X3 Pro 

Samsung Galaxy S21 

OnePlus Nord 2

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