While most people seem to manage just fine with a single SIM card in their smartphone, some -- especially travelers, who can save money by fitting a local SIM card into their handset -- love the flexibility that being able to switch between carriers or numbers has to offer.
Here's how you can install a second -- or even third -- SIM card into your smartphone. And don't worry -- there's no jailbreaking or rooting required.
Note that unless your handset is unlocked you will be restricted to SIM cards from the carrier to which your handset is locked.
Simore is a company that specializes in smart dual or triple SIM card adapters, and there is a whole variety to choose from.
Must-have iPhone accessories (April 2016)
Now, you might be wondering where the extra SIM card -- or cards -- fit. The trick that Simore employs is to use ultra-thin ribbon cables to make a connection with the smartphone underneath the existing SIM card, and then snake this ribbon out of the phone, either past the SIM card tray or battery lid -- to the outside where the other SIMs attach.
Take, for example, the Simore X-Twin 6S Plus, a dual SIM device for the iPhone 6 that allows the handset to have two SIM cards fitted (1x nano SIM, and 1x standard SIM). The nano SIM sits in the SIM card tray along with the tail of the X-Twin 6S Plus adapter so that it makes contact with the SIM card pin assembly inside the handset (yes, that ribbon cable is thin enough to fit between the SIM tray and the body of the iPhone 6). Then the other SIM card fit into the adapter.
It's not as complicated as it sounds, as this video shows:
Now you don't want to be walking around with a ribbon cable hanging off your handset, which is why you pop it all into a supplied case, which keeps everything tidy. The case also protects your handset and also serves as a holder for additional SIM cards and a SIM tray pop-out pin.
The kit, which includes the adapter and a case for your iPhone 6s, is €35 (around $40). If you have an iPhone 6s Plus you can still use the kit but you'll need to find a flexible rubber case to house the adapter.