eSIM – what & how?November 2nd, 2020
Don’t believe in mixing business with pleasure? eSIM and dual SIM compatible devices could change your view on that. If the idea of having your Business mobile number and your Personal mobile in one device appeals, read on…
What is an eSIM? An eSIM is small chip embedded in the device which is installed during the manufacturing process.
Not all networks or carriers support eSIMs yet, in the UK O2, EE and Vodafone do. What are dual SIM devices? A dual SIM device can take two SIM’s rather than the usual one, enabling you to easily have both your business and personal mobile numbers on one device.
Some dual-SIM devices take 2 plastic SIM cards, more recently dual-SIM devices with a slot for a plastic SIM and an embedded eSIM, have become available.
Apple added eSIM capability to the 2018 iPhones. Devices that support SIM include; iPad Pro, iPhone XS, XS Max and XR, the new iPhone 11, 11 Pro and 11 Pro Max. The Pixel 3 and 3 XL.
How does it work?
There are two ways in which eSIM devices operate: Dual-SIM-Dual Standby mode (DS-DS) Most Dual-SIM devices operate in a Dual-SIM-Dual Standby mode (DS-DS) where both the plastic SIM and the eSIM can make or receive calls.
When someone calls either number the phone will ring. In this mode when one SIM is active, e.g. making or taking a call, the other is not, calls to the dormant SIM will go to voicemail until the other SIM is not being used.
Dual SIM-Single Active mode (DS-SA) Some Dual-SIM devices operate in a Dual-SIMSingle Active mode (DS-SA) where you MUST manually choose to use either the plastic SIM or the eSIM.
Meaning only one SIM (mobile number) will be active at any one time. If someone calls the number linked to the active SIM the phone will ring, if the number associated with the inactive SIM is called it will go to voicemail as the SIM is not active, equivalent of phone being switched off.