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A Dual SIM phone uses two different SIM cards with only one of them being active at any one time which means that when one SIM card works, the other is out of service. To use the second SIM card, you will need to manually activate it – the first SIM will disconnect when that is done. Each SIM card will give you a phone number and a connection to a mobile network. The mobile phone will hold two numbers and two profiles simultaneously. This means you are able to place or take calls and send or receive texts on either of the two numbers that you have. You can also decide which number to give to who for whichever reason.
Dual SIMs…on two different or the same network?
For a dual active SIM phone anyone can use two different networks on the same mobile phone and switch between them very easily. If your mobile provider offers good tariffs for calls but not for mobile data and maybe has poor coverage, then you can add another SIM on a different network to make sure you are covered. Two SIM cards means more flexibility and can sometimes save you money as well and now because a dual SIM phone has basically all the same features as a regular smartphone, there aren´t any major disadvantages for switching to a dual SIM phone.
With a dual SIM phone, users can keep separate contact lists on each SIM and also roam easier by being able to access a foreign network while still maintaining the existing local card. Selling agents of foreign SIMs for travel purposes usually encourage dual-SIM operation with a home country and a local SIM both in the same device. When you have a dual SIM, going abroad just means connecting to the travel SIM card which is already placed in your phone. You have a choice to be able to switch it on for all services or simply just choose to switch on services you use the most such as data or calls.
The major benefit of owning two SIM cards in one phone is that you can be connected all the time. But the downside is that dual-SIM smartphones are harder on battery life than on a normal single SIM smartphone.
Batteries drain faster on dual SIM smartphones because the one and only battery is used to charge two circuits at the same time and this means more power being used. Dual-SIM phone enables a phone user to use two different SIM cards with two separate mobile networks and two separate phone numbers, all on one mobile device.
Dual-SIM smartphones were never as popular in the UK as they were elsewhere but they have recently become more in demand over the last few years as more and more people now buy unlocked smartphones from all the many manufacturers.
Dual-SIM smartphones allow you to use two different SIM cards at the same time on one handset. This means you can be simultaneously connected to two mobile networks on just one device. The advantages range from being able to use a single device for both personal and work usage, to being able to take advantage of greater coverage and lower price on two mobile networks power drainage. There are three major use cases for a dual-SIM smartphone:
Dual-SIM smartphones normally aren’t popular with the mobile networks as they allow you to easily side-step charges from the mobile network as mentioned in above paragraph (e.g. when travelling abroad or for when you want to call other countries). It is also essential that your handset7device is unlocked and not tied to any network in particular. And so For this reason, you will probably need to buy your dual-SIM smartphone device from an electronics retailer and without a SIM and with the device not locked.
How to choose a dual SIM smart phone
When you are shopping for a dual-SIM mobile-phone you need to keep in mind three important things:
Dual-standby versus Dual-active
The majority of dual-SIM mobile phones for consumers use dual standby tech.
A huge percentage of dual SIM smart phones are using “dual-standby technology”. More commonly it is known by its full name of dual-SIM dual-standby and abbreviated version of DSDS. On a dual-standby mobile phone, it’s only possible to use one SIM card at a given time for making and receiving mobile phone calls. When one SIM card is being used for a call then the other SIM card will be disconnected for the running time of the call but in most cases this will not make too many issues however you definitely should just keep it in mind.
Maybe you are a big user of your phone and are hard on your battery power by needing to place multiple mobile calls at the same time. In this case you will really need to buy a dual sim dual active mobile device ie DSDA technology. DSDA phones are difficult to shop for and are usually a lot more expensive than regular single SIM phones but the benefit is that they have two transceivers so you can make a phone call on both SIM cards at the same time. Doing things such as putting one call on hold whilst you handle the other call is also possible and you can even join the two phone calls together for one conversation.
And latest news is that Some newer dual-SIM phones have “Dual SIM 4G” technology. Just recently it seems that most dual-SIM smartphones are now coming with 4G+2G connectivity. This means that you will get 4G connectivity on your first and main SIM card and 2G on your secondary SIM card. Need to keep this in mind as you will need to ensure the mobile network used on your secondary SIM card slot can support and use 2G coverage.
Most mobile networks in the United Kingdom still provide 2G coverage to an extent. ‘Three’ the network provider is an example of one that no longer provides 2G coverage. This then means that you cannot use a SIM card from Three in the secondary SIM card slot, or from any other virtual network operator that uses coverage from Three such as Superdrug Mobile and more.
Some countries Outside of the UK have already switched 2G coverage off. 2G coverage is no longer available in countries like Taiwan, Japan, Singapore and Australia.Other countries such as the United States are beginning to turn off. For example: AT&T has switched off 2G. Again, something else worth taking note of as it might affect you when you are visiting other countries with a dual-SIM device.
Newer devices will provide support for 4G+4G ie. Dual-SIM 4G connectivity or sometimes 4G+3G connectivity. This will enable you to access a wider range of connectivity on both SIM card slots, including mobile networks that lack 2G support. Maybe worth considering a device like the Honor View 10 if you would prefer Dual SIM 4G connectivity.
The design of the SIM Card Slot
And you should be reminded that it is worth taking a look at the design of the SIM card slot. In some mobile phones the second SIM card slot also acts as the micro-SD card slot.
Dual-SIM phones will more than likely have a SIM card tray where you’re able to insert a SIM card from each provider…usually consisting of two micro-SIMs or two nano-SIMs
In a few cases the SIM card slot will be designed so that the slot for your second SIM card acts as the slot for your micro-SD card. This can be tricky as you will need to decide between having dual-SIM connectivity and additional micro-SD storage. There are usually some ways available to bypass this by for example fusing part of the secondary SIM card onto the back of your micro-SD card although it has to be said that these can of course be dangerous and therefore nor t recommended.
When choosing a handset look for one that has separate physical slots for the secondary SIM card and micro-SD card where possible.
How to buy a dual-SIM smartphone device
If you have decided to buy a dual-SIM smartphone, you will need to buy it on an unlocked basis from an electronics retailer as mentioned previously. It is rarely possible to buy it on a contract from an individual mobile network because dual-SIM smartphones tend to be unpopular with the big network providers as they make it easier for you the consumer to avoid charges for example in the case for international calling and roaming.
When you are shopping for a dual-SIM smartphone, concentrate on other related features that can make your life easier. Eg., Motorola has a feature called intelligent calling and this feature automatically chooses the best SIM card when you are making a call. In addition, Huawei has a feature called App Twin allowing you to run two separate scenarios of a single application. For example: you can manage two separate WhatsApp accounts – one for your personal phone number and one for yourwork phone number.
If you need more than one phone number on the same one phone or maybe multiple networks on that one device, you will need a dual SIM phone.
And why have dual SIM? How does this multi-SIM thing actually function?
When and why would I need a dual SIM?
Well there can be many reasons why you might need or want more than one SIM in one single phone but the most common reason is simply for having two numbers because You might want to have your personal phone number and your work number on just one device and not have to carry two mobile phones …and potentially having more than one charger to think about never mind the maintenance and running costs.
Having more than one network to choose from in your phone means you have more chances to get connected no matter how far or to where you travel or visit and never having to be too concerned about a place not having enough coverage.
No matter what your reason is for having a dual SIM smartphone you will need a smartphone that can handle the double SIMs.
How does a dual SIM smartphone work?
The most obvious difference of a dual SIM device that other mobile phones do not have is a tray that can load in more than one SIM. But now that eSIM is becoming more common you may find dual phone number for one phone and without having to insert two SIM cards.
For this time anyway most dual SIM setups use a dual SIM smartphone and these come in two types: DSDA and DSFA.
The first type of technology Dual SIM Dual Standby will disable one SIM while the other SIM is being used. So yes, that means the other line will be ‘busy’ if anyone tries to call it. Not really the best for business users then.
Dual SIM Full Active is the other option and this enables a user to have both SIMs constantly connected so you can receive two calls at once giving you the freedom to jump between calls as and when you need to.
Can I use multiple networks on a dual SIM phone?
Technically anyone can use two different SIM networks on the same phone. But only if it is not locked to a single individual network provider.
Sand you really need to bear this in mind when buying a mobile phone. You can buy the phone offline or SIM only so that it will not be locked and therefore giving you the freedom to choose and use which networks you want.
What are the best dual SIM phones?
There is a huge range of dual SIM options out there right now and they are all Android. So not so good if you are a fan of Apple. Or just cope with the hassle of carrying two separate handsets.
Most popular dual SIM smartphones include the OnePlus 8 Pro, Huawei P40 Pro, Honor View 20, Oppo Find X2 Pro and Samsung Galaxy S20.
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