If you enable the SMS and MMS option, Signal will be used by Android as default app to handle incoming SMS and MMS. The corresponding configuration option can be found in the settings of the Signal app under "SMS and MMS". You can optionally configure Signal as default messenging app. It does not matter which sim card, wireless network etc is providing the connection. As with single sim usage, sending and receiving these messages requires an internet connection. This means all encrypted messages are addressed from and to the one phone number that you chose to register with the Signal app. You can then use Signal to send and receive encrypted messages, as you would do on a single sim phone. Sending and Receiving Encrypted Messages: Registration: Register Signal with one of your phone numbers, as you would do on a single sim phone. Installation: Simply install Signal as you would on a single sim phone by downloading it from the Google Play app store. The following steps describe how to install and use Signal on a phone with two or more sim cards: Usage Scenarios Fresh Installation of Signal on a Phone with Multiple Sim Cards Signal can send and receive encrypted messages only from one phone number (i.e., from the phone number that has been registered with the Signal app). ⚠︎ Sending and Receiving Encrypted Messages: Specifically, this is the phone number that has been used in Signal's registration process. Instead, the Signal app may only be registered with one phone number at any time. ✓ Signal can be used to send regular SMS (using any one of multiple sim cards long-pressing the send button allows to choose the sim card to be used) LimitationsĪdditional phone numbers cannot be registered with the Signal app. ✓ Signal can be used to receive regular SMS (using any one of multiple sim cards) ✓ Signal can be used to send and receive encrypted messages (addressed to and from the phone number that was used during registration) ✓ Signal can be registered with one phone number Signal (previously TextSecure) on Android can be used on dual-sim or multi-sim smartphones, albeit with some limitations regarding use of the additional sim cards. Note: The source article did not provide any URLs for references.Using Signal with Dual Sim or Multi Sim Phones – Vulnerabilities: Weaknesses or flaws in software or hardware that can be exploited by attackers. – Samsung Semiconductor: The division of Samsung responsible for manufacturing semiconductors, including Exynos chips and modems. – Samsung Security Bulletin – September 2023 Security Update However, it is important to note that Samsung has concluded software update support for the Galaxy Note 10 and the Galaxy Note 10+ models, following a four-year period of updates. Mid-range smartphones and high-end tablets are expected to receive the update in the second phase, with entry-level phones and affordable tablets receiving it at a later stage. The company plans to roll out the September 2023 security update initially to its flagship smartphones such as the Galaxy S20, Galaxy S21, Galaxy S22, Galaxy S23, Galaxy Z Flip 3, Galaxy Z Flip 4, Galaxy Z Flip 5, Galaxy Z Fold 3, Galaxy Z Fold 4, and the Galaxy Z Fold 5. These vulnerabilities were discovered across several applications and features, including the Samsung Keyboard app, security settings, Dual Messenger, Samsung Knox AI, storage of Phone and Messages apps, Settings Suggestions, One UI’s Folder Lock feature, Weather app, Wi-Fi Auto Hotspot, inbound SMS handler, and lockscreen settings. Samsung itself has resolved 35 security flaws within its devices, which have been incorporated in the September 2023 security update. In addition, Samsung Semiconductor, responsible for producing Exynos chips and modems, has also contributed four security patches, consisting of two Moderate and two Low fixes, specifically for affected Galaxy smartphones and tablets. The update includes fixes for various security concerns, with four marked as ‘Critical’ and 19 marked as ‘High’ vulnerabilities, provided by Google. The September 2023 security update aims to address a total of 62 vulnerabilities that have been identified in previous versions of the software. The company’s latest security bulletin reveals important information regarding the upcoming patch. Samsung has recently unveiled details about its upcoming security update for September 2023.
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