The best dual SIM smartphones in the UK 2023

Dual SIM smartphones appeared on the Asian market and have conquered the European market for a few years and are very successful for several reasons. They differ from each other according to the management of the two SIMs, the format of the chips, the quality of the battery, their dimensions and their other features. Follow our guide to choose the best dual SIM smartphone.

Xiaomi Mi Note 10 Lite 1

Best value for money

Xiaomi Mi Note 10 Lite

The best dual SIM smartphone in 2021

The Mi Note 10 Lite can detect two SIM cards that are both 4 FF format nano-SIM. Among other things, it includes a 5,260 mAh battery and a 6.47" curved AMOLED 3D display.

286 £ on Amazon

The Mi Note 10 Lite is one of the recent creations of the Xiaomi brand. It can detect two SIM cards simultaneously in Dual SIM stand-by mode, which means that when one of the SIMs receives a call, the other one automatically deactivates. However, the activation or deactivation of the chips can be done manually in the settings of your smartphone. The format of the chips is 4FF or Nano-SIM.

A 5,260 mAh Lithium-ion battery powers the device for optimal battery life. The smartphone also has a voltage of 30V allowing the Mi Note 10 Lite to charge quickly and gain hours of use. An Android 10.0 MIUI 11 operating system combined with a Snapdragon 730 G 2 x 2.2 GHz / 6 x 1.8 GHz processor offers unparalleled smoothness to this smartphone.

Huawei P30 Lite 2

Best value for money

Huawei P30 Lite

The best entry-level dual SIM smartphone

Huawei has designed the P30 Lite, a 4G unlocked dual-SIM Shift smartphone, to meet your needs. This device is equipped with a 3,340 mAh battery, a 6.15" screen with FHD+ resolution and 4 cameras.

206 £ on Amazon

The P30 Lite can detect both nano-SIMs simultaneously and both have access to the 4G network. Dual-SIM Shift category, the smartphone of the Huawei brand has an active card by default and the activation of both SIMs is done manually in the phone settings. However, both chips can receive calls and messages even without activation.

The P30 Lite is powered by a non-removable Li-ion battery with a capacity of 3,340 mAh. This means you'll have longer battery life. With its 9 V 2 A, you will be able to make a fast charge in all peace. For more security, in case of theft, the device has a fingerprint sensor so that it can not be unlocked.

Samsung Galaxy S21 Ultra 3

Best premium value for money

Samsung Galaxy S21 Ultra

The best high-end dual SIM smartphone

The Samsung Galaxy S21 Ultra is a very complete smartphone with dual SIM. Compatible with the 5G network, it is a model with a great autonomy: a Lithium-ion battery of 5,000 mAh.

876 £ on Amazon

Both SIM cards are 4FF format and have access to 5G network connectivity. However, both SIMs can be detected simultaneously. It is considered to be the best dual SIM smartphone in its class. Moreover, this smartphone packs a powerful Samsung Exynos 2102 processor. Moreover, it offers good image quality with its 4 rear sensors of 108 x 12 x 10 x 10 MP and its 40 MP front sensor.

We have to admit that Samsung has outdone itself with this device that can store up to 128 GB of data. Its 6.8" screen offers HD+ resolution and 8k video for a more immersive experience. This smartphone can also withstand a fresh water pressure of 1.5 m deep for about 30 minutes.

OnePlus 8 Pro 4

Best in style

OnePlus 8 Pro

A premium device

The Oneplus brand has designed a Dual-Sim Stand-by 5G unlocked smartphone for everyone to enjoy: with two 4FF size SIM cards, a powerful battery, a 6.78" Fluid AMOLED QHD+ display and four photo sensors that make all the difference.

623 £ on Amazon

The OnePlus 8 pro smartphone can work with any network operator since it is 5G unlocked. It can detect two SIM cards of 4FF or nano-SIM format. The activation of the latter can be done manually, but when one of the SIM cards receives a call the other one deactivates automatically.

The 8 Pro smartphone runs on a 4,510 mAh battery. This large capacity is ideal for powering its 6.78" screen. In addition, it is very powerful, via its Snapdragon 865 processor, 128 GB of internal storage and 8 GB of RAM.

Buying guide • November 2023

Best dual SIM smartphone

Any specific needs?

The best dual SIM smartphone in 2021

The best entry-level dual SIM smartphone

The best high-end dual SIM smartphone

A premium device

Your guide : Samuel

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Comparison table of the best dual SIM smartphones

Xiaomi Mi Note 10 Lite 5
Huawei P30 Lite 6
Samsung Galaxy S21 Ultra 7
OnePlus 8 Pro 8
Xiaomi Mi Note 10 Lite
Huawei P30 Lite
Samsung Galaxy S21 Ultra
OnePlus 8 Pro
The Mi Note 10 Lite can detect two SIM cards that are both 4 FF format nano-SIM. Among other things, it includes a 5,260 mAh battery and a 6.47" curved AMOLED 3D display.
Huawei has designed the P30 Lite, a 4G unlocked dual-SIM Shift smartphone, to meet your needs. This device is equipped with a 3,340 mAh battery, a 6.15" screen with FHD+ resolution and 4 cameras.
The Samsung Galaxy S21 Ultra is a very complete smartphone with dual SIM. Compatible with the 5G network, it is a model with a great autonomy: a Lithium-ion battery of 5,000 mAh.
The Oneplus brand has designed a Dual-Sim Stand-by 5G unlocked smartphone for everyone to enjoy: with two 4FF size SIM cards, a powerful battery, a 6.78" Fluid AMOLED QHD+ display and four photo sensors that make all the difference.
Operating system
Android 10.0
Android 9
Android 11
Android 10.0
Screen size
Snapdragon 730G 2 x 2.2 GHz / 6 x 1.8 GHz
Kirin 710 Octa-Core
Exynos 2102 Samsung
Snapdragon 865
5,260 mAh/30 W
3,340 mAh
5,000 mAh
4,510 mAh

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Buying guide - dual SIM smartphone

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How to choose your dual SIM smartphone

Knowing the right criteria for buying a dual SIM smartphone will help you make the best choice. Your preference can be based on the device's features or on the format of the SIM cards that can be used on it.

#1 - The way the SIM cards work

The SIM cards have a total of seven operating modes that differ in the way the chips are activated and deactivated. Those that require manual activation are: Pseudo-Dual and Dual-Sim Shift. Smartphones with Dual-Sim stand-by and Dual-Sim Active features detect both chips simultaneously. Thus, when one of the chips receives a call, the other one deactivates automatically.

#2 - The format of the SIM cards

SIM cards currently come in 3 formats. The oldest are the mini-SIM or 2FF. They were used on most phones before 2010. Called Micro-SIM, this type of 3FF format cards were for a long time the prerogative of the Apple brand. Later, other brands will adopt it, given their technical specifications. Currently, the most common are the 4FF or Nano-SIM cards. The most recent ones are the M2M or eSIM that are directly integrated into the smartphone.

#3 - The quality of the battery

Taking into account the quality of the battery means examining whether it is removable, its power and its charging time. This is because smartphones with removable batteries have specific slots to insert SIM cards. A powerful battery guarantees you longer autonomy. The charging time of the smartphone is also an essential purchase criterion. Indeed, it proves to be very useful depending on how often you handle the device.

#4 - The dimensions of the smartphone

The dimensions of the smartphone are measured in diagonal and in inches of which 1 inch is equal to about 2.56 cm. For an easier grip, you can opt for a 6.5" screen. However, a larger screen is much better for watching videos or playing games. Currently, smartphones are thinner. Also, the average height of a phone is about 1 cm.

#5 - The additional features

The choice of processor is very important when buying a smartphone. Among the best of them are the SOC Snapdragon, Exynos, kirin. They are the fastest and allow greater responsiveness. The screen resolution is also a major criterion in your choice. If you are looking for visual comfort, you can prefer QHD+ and FHD+ resolutions. A good camera can also make a smartphone interesting. If you want to take nice pictures, go for a smartphone with at least 16MP.

What about triple SIM smartphones?

Triple SIM smartphones are starting to flood the market with brands like Realmi, Xiaomi and many others. For some products, the third SIM is an e-SIM. However, they have not yet dethroned dual SIM smartphones which are more ergonomic and easier to maintain.

How to maintain your dual SIM smartphone?

Currently, dual SIM smartphones are outperforming single SIM models. This is due to the fact that they offer many advantages and are not bulky, given their exceptional size. However, they require minimal maintenance to perform their functions properly.

Uninstall unnecessary autostart applications

Most dual SIM smartphones sold in stores have basic applications already pre-installed. Some of them are required for the device to work properly, while others are just fancy. Therefore, if you are going to install applications that are necessary for your daily life, it is clear that you will be in trouble, as this could reduce the execution speed of the already congested processor. So, for more fluidity and responsiveness on the part of the smartphone, make sure to disable the automatic execution or uninstall some unnecessary applications altogether.

Adjust the brightness of the screen

A screen lit to its maximum capacity can lead to premature deterioration of your battery. Therefore, reduce the contrast, brightness and saturation to optimize your visibility. This manipulation can be done via the settings of the device and will ensure the longevity of your battery.

Avoid prolonged standby time

A standby time of more than 30 seconds could actually increase the energy consumption. It is therefore essential to make a setting in this sense to optimize the battery life. Moreover, some smartphones tend to launch certain applications if they are not locked when you put it in your pocket.

The different types of dual SIM smartphones

There are several kinds of dual SIM smartphones on the phone market. They are grouped into two types: dual SIM smartphones blocked by the operator and those that are de-locked or decoded.

The dual SIM smartphone blocked operator

Blocked dual SIM smartphones are often devices purchased from network operators. They will block the detection of the SIM card other than their own. This marketing strategy poses several constraints to users. Using only one network is not really practical in case the operator has bad network reception in some places. Having two SIMs from the same operator would also mean having only one SIM card. Therefore, it will be better to unlock your smartphone to use different networks at the same time. This will be done for free if you request an unlock before the third month after purchase.

The dual SIM smartphone desimlocked

Desimlocked or decoded dual SIM smartphones are devices compatible with any other network operator. If you want to use SFR and Orange in the same phone, it's possible; or if you need to separate your personal life from your work. The best way to find out if your smartphone is unlocked or not is to insert a second SIM card from another network operator. If a network unlock code is required, it means that your smartphone is still blocked.

Dual SIM or single SIM smartphone?

The dual SIM smartphone

A dual SIM smartphone has many advantages, including the ability to connect to two different networks simultaneously. This feature will allow you to use only one cell phone to receive calls and messages from the office and from relatives. For those who are often on the move, you can have a SIM card with an international plan. Juggling from one operator to another will allow you to enjoy the benefits of both operators at the same time.

The single SIM smartphone

Single SIM smartphones save energy and allow users to know in advance if they are receiving business calls or if it is a phone call from relatives. In addition, a single SIM smartphone can hold a Micro SD card to make even more space in the phonebook. On the other hand, you will have to deal with the lack of network depending on where you are. Therefore, the purchase of another device to dissociate calls will be necessary.


If you're looking for convenience, go for dual SIM smartphones. They are more economical because you only need one phone instead of two. Your smartphone won't run down too quickly if you activate both SIMs, given the large battery capacity. You'll only notice a slight drop in battery power during the first hour of use. Then, the power consumption will stabilize as you use it, like a single SIM smartphone.

Why get a dual SIM smartphone?

Buying a dual-SIM smartphone can only have advantages. There are many reasons why you should buy one. The ones listed below are only the most obvious ones.

Using 2 phone lines means that you have to combine your subscriptions, which means that you will benefit. Indeed, if you choose to buy packages from an operator that offers a better rate for data use and another package for calls is preferred with another operator. You will be able to use both packages even if they are offered by two different operators.

In terms of phone coverage, two SIMs from different operators will prevent you from perching on the roof to get a network bar. This network interception is due to the competition between operators. Some cover an area better than others. So you could take advantage of the phone canopy of two operators.

If you are an entrepreneur, this is the best way to manage your customers and receive calls from the family on the same device. As a result, you won't have to carry two smartphones in your pocket. Just one dual SIM smartphone and you're done! The two SIM cards are completely independent. Receiving and making calls on one of the two lines does not present any risk of disconnection if the other chip receives a call. So your life will only be easier with a phone that can hold all your contacts.

If your dual SIM smartphone has a <a title=" href="" target="_blank" rel="noopener"><span style="color: windowtext; text-decoration: none;">eSIM</span></a><span style="float: none;">,</span> this will allow you to have 2 user profiles. So it will be possible for you to take out 2 separate subscriptions according to your preferences.</span></p>


Choose a smartphone that is compatible with your real needs

Indeed, the best smartphone is the one that meets all your expectations. You need to know your real needs to better enjoy the device's features.

Prefer a dual SIM smartphone with two different SIM formats

This is a better way to make your smartphone more convenient. If it can hold two separate SIM formats, you won't have to cut your chips at the risk of damaging them.

Respect the charging time of the smartphone

Exceeding or ignoring the smartphone charging time will deteriorate the battery and make your device overheat. Don't hesitate to read the user manual thoroughly.

Protect your smartphone

To provide more protection for your smartphone, you can opt for screen covers and silicone covers. Some smartphones already have scratch-resistant screens and waterproof casing.

Don't leave your SIM cards lying around

A SIM card is just as personal as your ID card itself. It contains both sensitive private information. It is therefore preferable to block it immediately in case of loss by calling the concerned network operator.


Is it possible to have the same phone number on both SIM cards?

With the Multi-SIM option, this is possible, but with a specific subscription that will transfer calls to one of the two SIMs and messages to the other.

Can a dual SIM smartphone be used with two different operators?

If the smartphone is unlocked, it will be able to work with two SIMs from two different network operators.

Can a dual SIM smartphone work without inserting the second SIM card?

Even if you have only inserted one card, the smartphone will work properly in the same way as it would with two SIM cards.

Can we use two different plans with a dual SIM smartphone?

It is possible to have an internet plan on one of the SIMs and an international calling plan on the other and all on the same smartphone.

How to select the SIM to be used in priority to call, use the data or send an SMS?

The SIM card to be used for calls is the one whose operator offers the best rates, the one for data usage and messages too should be chosen the same way.


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March 2022 : Translation of this buying guide from our partner

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Our selection
Xiaomi Mi Note 10 Lite 9
Xiaomi Mi Note 10 Lite
Huawei P30 Lite 10
Huawei P30 Lite
Samsung Galaxy S21 Ultra 11
Samsung Galaxy S21 Ultra
OnePlus 8 Pro 12
OnePlus 8 Pro


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