Dual SIM handsets continue to gain in popularity. From being a product aimed at limited regional markets a few years ago, they are now nearing a majority of new device sales worldwide. Originally sales were driven by the rise of far eastern vendors. Bringing extensive Dual SIM expertise from their home markets, their devices became popular in niche segments elsewhere – even when not directly sold in those markets. Public awareness rose significantly when Apple launched their latest devices in Dual SIM format (although one SIM is eSIM in markets outside China), and we now see all the major vendors selling dual SIM models across the world.
With this backdrop, the GSMA TSG Dual SIM requirements (TS.37) and test book (TS.42) were timely. Originally released in 2016, these are now in their 5th edition. They aim to give consistent network-facing behaviour and a user-friendly experience regardless of device vendor.
Major vendors are already compliant. Adoption of the TS.42 test cases into GCF is well advanced and is expected to complete in mid-2019. This will allow accreditation of Dual SIM behaviour through independent test labs.
Development of the specifications continues as new implementations arise; current work areas include Bluetooth accessory interactions, updates for devices capable of two simultaneous VoLTE calls, and automated call forwarding options.
The GSMA’s TS.37 and TS.42 can be downloaded at the links below.
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