Your guide to the latest and best dual-SIM phones of 2017. Check out our latest reviews and buyer’s guide on the top dual-SIM phones for this year.
Dual-SIM smartphones let you use two SIMs in a single phone. Most people who use dual-SIM phones find the functionality useful for mixing work and pleasure, rather than carrying separate phones for their work- and personal contracts. See all phone reviews
Also see: Best Phone Deals
Dual-SIM phones are also useful for maintaining two personal contracts, however, whereby one might offer a good rate on calls and texts, and the other offers unlimited data. Or perhaps you frequently travel abroad, and would like to carry a UK SIM for when you’re at home and another that is local to the country you’re visiting. Also see: Best kids’ phones 2017
Whatever your reason for requiring a dual-SIM phone, a problem in the UK is that most smartphones do not include the functionality as standard. Indeed, hardly any of the UK phones we are sent for review are dual-SIM models, and even where dual-SIM versions are available they are rarely intended to go on sale in the UK. Also see: Best smartphones 2017.
Dual-SIM phones are incredibly popular outside the UK, but for some reason us Brits are being left out of the dual-SIM party. And we want in.
This is one reason why the Chinese market has become a popular solution for picking up a dual-SIM phone, but there are risks involved – read our advice on buying grey-market dual-SIM phones .
Another way you can find a dual-SIM phone is to search a site such as Amazon or eBay for ‘dual-SIM phone’, ‘dual-SIM Samsung’ or ‘dual-SIM Sony’ and so on. Having seen the standard single-SIM versions that are intended for UK sale we have no doubt that many of these are great phones, but having not personally laid our hands on the dual-SIM variants we’re reluctant to recommend them here.
They also tend to go off sale as soon as we add them to the round-up. Of course, you are more than welcome to recommend these phones in the comments below.
In this group test we recommend only phones that are sold in the UK with dual-SIM functionality as standard, and that we have personally reviewed. And in the future, we’re hoping that the increased demand for dual-SIM phones means we will begin to see more and more dual-SIM smartphones supplied to us for review. Also see: Best budget phones and best phones under £50.
Something we’ve noticed when shopping for dual-SIM phones is that the manufacturer very rarely provides any information about the functionality other than it exists. It doesn’t tell you how the dual-SIM functionality works in practice, nor whether both SIMs support 4G, or even what size SIM cards they accept.
As we’ve learned you can never assume: you’ll need to contact the manufacturer or check spec tables, reviews or forums to find out this information.
For that latter concern, as technology journalists who are always having to swap SIMs between the various phones we have in for review, we have found the best solution is to adopt a Nano-SIM for our personal smartphone, then pair it with an adaptor when we need to use it in a phone that supports Mini- or Micro-SIMs. SIM adaptors are very cheap, but some are better than others.
We like the MediaDevil Simdevil, which comes with Nano- to Micro, Nano- to Mini and Micro- to Mini adaptors, plus a SIM tray ejector tool. It costs £1.97 from Amazon. If you’re planning to stick with the phone, however, you can always request a new SIM of the correct size for free from your network operator, then swap over your number. Also see: Best sounding phone 2017.
In all the dual-SIM phones we’ve tested both SIMs are on standby at all times (known as dual-standby phones) , but you can actively use only one SIM at a time. This means that either SIM can accept a phone call or text at any time, without you having to actively swap between them or reboot the phone.
However, if you get a call on one number while a call is active on the other, it won’t start ringing in your ear or give you the option to put the first caller on hold – the call will simply not be successful.
Dual-standby phones require you to specify one SIM or the other for data, though unless specified you can choose between the two on the fly for calls and texts.
Dual-active SIM phones also exist, which use two modems and allow you to receive calls on both numbers at once. We’ve not tested any dual-active phones. See also: Best Android smartphones in UK: What’s the best Android phone you can buy in 2017?
If it’s you who wants to make a call or send a text, Android has a standard SIM Management menu that lets you specify which SIM should be used for voice calls, video calls, messages and mobile data. You can either specify a particular SIM for each of these tasks, or leave the setting at Always ask.
If you choose the latter, the next time you want to make a call or send a text you will be asked which SIM you want to use.
The data connection is where there seems to be a lot of confusion when it comes to dual-SIM phones. Whereas both SIM slots on some dual-SIM phones are capable of supporting 3G or 4G connections, you can use 4G on only one SIM at a time.
Unlike with calls and texts the data connection can’t be on standby for both SIMs: you must specify which SIM you want to use rather than select one when prompted.
Of course, this isn’t always the case, and some phones support 3G/4G only on their first SIM slot, and you can’t change the data connection for browsing the web or making video calls. You can still specify which SIM should be used for calls and texts.
By default, when you are using the data connection on one SIM and a phone call comes in to the other it will pause the data connection on the first.
In the Moto G you’ll find a Connection priority menu, which lets you specify that calls should instead go to voicemail instead of interrupting your browsing. There is no such option on the other dual-SIM phones we’ve tested, but it’s not something we’d be likely to change in any case. Also see: Best new phones coming in 2017.
Another issue when using dual-SIM phones is where your contacts are stored. We found that by default the contacts from both SIM cards are stored in the phonebook.
If you’d rather see the contacts from only one SIM, tap the three dots icon (within the Contacts app) and choose ‘Contacts to display’. You can then select All contacts, Gmail contacts, phone contacts or one of your two SIMs.
Usually when you add a contact you get a pop-up menu asking whether you want to store the contact on your phone memory, your SIM or your Google account. Here you’ll now see two SIMs in the list rather than one.
A quick way to turn this off and prevent you always having to choose is to open the SIM management menu, select Contact binding and then select a specific SIM.
Physically inserting a second SIM into a single-SIM phone would be impossible without altering its design in some way, but it is possible to achieve the same feat by adding a second phone number.
OnOff is an app for iPhone and Android that lets you have multiple phone numbers on one phone. Right now it supports French and UK numbers, which work like any other number for receiving phone calls and text messages. More conveniently, though, you can turn off these numbers when it suits.
This means you could potentially give your work colleagues or clients one phone number that is switched off outside office hours. Or you could give your friends a number that is switched off during office hours.
Another bonus: should your phone battery die, you can log into the app on a friend’s phone and still get your calls and texts.
The app itself is free, and you get a free trial with limited functionality for one phone number. If you like it you can then ‘activate’ that number, which unlocks all the features of the app. You can set up multiple lines, though these must be paid for too.
OnOff pricing starts at £2.99 per month, with full details here .
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