In the early morning of September 13, at the annual Apple conference called 'Tech Spring Festival Evening', iPhone Xs, iPhone Xs Max, and iPhone XR came out one after another. The biggest feature of this year's new iPhone is the first time to support dual-card functionality, Apple. At the press conference, we introduced the latest function with 'DSDS' (Dual Sim Dual Standby). In fact, the translation is what we often call 'double card dual standby'.
Dual card dual standby does have a huge market demand in China. Many users are a mobile phone number, a mobile phone number, and even more. Since our telecom operators basically send physical SIM cards, this is The new iPhone in mainland China, Hong Kong, China and Macau is a unique dual-entity SIM card slot design. In the support of dual-card, Apple has finally taken care of this function has been popularized on mobile phones. Many Android manufacturers.
But in fact, there are differences between dual card and dual standby, which are divided into dual card dual standby single pass and dual card dual standby dual pass. According to the screenshot of the new iPhone system currently exposed online, Apple's dual card dual standby is the most basic currently. Dual SIM dual standby single pass, does not support VoLTE calls. For example, in actual use, when the new iPhone is plugged into a dual card, when the card 1 is connected to the call, the card 2 will be converted to 2G and the network signal will be lost. Used for calls, and if the card 2 calls will be prompted to the user busy.
In principle, the dual-card dual-standby 'single-pass' mobile phone only has one set of RF units (including baseband and antenna). It needs to constantly switch between the two networks and automatically search the network, just because the switching frequency is fast and the time is very high. For a short time, the user has the illusion that the dual card is on standby at the same time. Therefore, when the card 1 calls, the signal of the card 2 will be temporarily blocked until the call ends.
At present, the dual-card dual-standby standard that we can generally achieve is more advanced than the new iPhone, including telecom card intermixing and support for VoLTE. Huawei’s September 12th, just released in Guangzhou, can support dual telecom cards. Achieve dual standby function. These technologies are currently not available to the iPhone.
So it is inevitable that some people vomit, full of joy to wait for the dual-card iPhone, but it is a more sloppy dual card single pass - if there is no wifi scene, when we use the card 1 data to play the game, then silently pray card 2 Don't call it, otherwise it will cause the card 1 network outside the call card to be disconnected due to the characteristics of the single pass, let us become a 'piggy teammate'.
And there is news that Huawei's flagship mobile phone Mate20 will support dual-card dual-pass. On September 17, an online PPT screenshot of Huawei's Mate20 product technology was exposed. This picture has roughly two parts, the left part shows The Huawei Mate20 mobile phone supports the dual-card dual-standby dual-pass function. The right part of the phone writes the pain points of the current dual-card dual-standby single-pass: Nowadays, the voice of the dual-card dual-pass is getting higher and higher, and no one wants to miss the call. The secondary card phone, or the secondary card when the game is called, the network is disconnected, etc. Obviously, the appearance of such a screenshot makes the long-awaited 'dual card dual-pass' function from many users become reality.
In principle, Huawei's dual standby dual-pass mobile phone 2 sets of radio frequency units are responsible for the network of two cards. Since the two sets of radio frequency units are independent of each other, combined with specific scenarios, it is possible to continue while calling with card 1. Use the data of the card 2 to access the Internet, or use the card 2 to make a call. This convenient function is the long-awaited double-card user in China, including the author. Once we only dared to use the main card with the phone to access the Internet. Otherwise, if you use the secondary card to access the Internet, you will always be worried: because the primary card comes to the phone, the secondary card will be disconnected. With dual-card dual-pass, when there is no Wi-Fi, we can use the data while playing. Games or check information, no matter which card calls, you don't have to worry about becoming a 'piggy teammate'.
We know that Huawei's dual-card dual-standby dual-pass uses the characteristics of VoLTE: it is a voice solution that implements service control based on IMS (IP Multimedia Subsystem) network through LTE network as a service access, which can realize data and The voice service is unified under the same network. Before this, because 4G network could not carry voice calls separately, when the 4G began mass commercialization two years ago, operators basically adopted CSFB and SGLTE solutions. SGLTE and VOLTE can support Internet access while talking, but the difference is that SGLTE can only use 2/3G to access the Internet during a call. VOLTE can connect to the Internet while talking on the 4G network.
We also simply put a test of Volte before, it is obvious that when there is a phone access, the VoLTE function is enabled, and the game can be continued while talking, but only when it is not turned on. It is a single-card VoLTE, which is now developed into dual-card VoLTE. One card is used to carry voice, and one card is used to carry data.
In general, although the majority of fruit powder has been looking forward to the 'double card dual standby' for many years, it has finally been realized on Apple, but whether it is due to market or policy issues, Apple has fallen behind most of the domestic mobile phone manufacturers in this function.