在10月28日举行的双十一焕新季发布会上，华为正式宣布 Mate 90 全系手机将支持“四卡三待”功能 1。该功能允许用户同时使用两张实体 SIM 卡和两组 eSIM 号码，实现三张卡同时在线、通话及上网 1。其中，Mate 90 Pro Max 已作为业界首发机型搭载该特性，而标准版和 Pro 版将通过后续 OTA 升级开放这一能力 1。
技术细节显示，手机最多存储两张实体 SIM 卡与两组 eSIM 号码，合计四个通信号码；具体组合方式可实现三张卡同时待机（如两张实体卡加一张 eSIM），均支持通话、上网和收发短信 1。在界面显示上，Pro Max 信号状态栏同步显示三卡信号，主卡完整显示、副卡堆叠显示 1。余承东曾表示四卡三待相当于省了一部手机 1。从历史背景来看，华为 eSIM 布局始于 2025年12月的 Mate 80 RS，2026年9月 Mate XT 2 等机型标配 eSIM 1。
Huawei announced during its Double Eleven refresh season launch event on October 28 that the entire Mate 90 smartphone lineup will support a feature known as "four SIMs, three standby," allowing users to manage multiple communication numbers simultaneously 1. While the Mate 90 Pro Max has already launched with this capability, the standard and Pro models will receive the functionality through subsequent over-the-air (OTA) software upgrades 1.
The technology enables devices to store up to two physical SIM cards and two eSIM profiles, creating a total of four available communication numbers 1. Users can configure the system so that three cards remain active at the same time—for instance, combining two physical SIMs with one eSIM—while all active lines retain full capabilities for voice calls, internet connectivity, and SMS transmission 1. On the Mate 90 Pro Max, the status bar displays signal indicators for all three active cards, with the primary card shown in detail and secondary cards presented in a stacked view 1.
This development builds on Huawei’s broader integration of eSIM technology, which began with the Mate 80 RS in December 2025 and became standard on models like the Mate XT 2 by September 2026 1. Richard Yu, Huawei’s consumer business group chairman, previously commented that the "four SIMs, three standby" feature effectively eliminates the need for carrying an additional mobile device 1.
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