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Messaging app, Signal says it’s seeing a rise in the number of its new users, so much so that the rise is causing delays in phone number verifications of new accounts across multiple cell providers. The rise is most likely as a result of rival WhatsApps new privacy policy.

Verification codes are currently delayed across several providers because so many new people are trying to join Signal right now (we can barely register our excitement). We are working with carriers to resolve this as quickly as possible. Hang in there.

— Signal (@signalapp) January 7, 2021

Signal

Signal logo Signal is a mobile app developed by Signal Messenger LLC. The app provides instant messaging, as well as voice and video calling. All communications are E2EE unless you choose to send as SMS. Its protocol has also been indepedently audited (PDF) https://eprint.iacr.org/2016/1013.pdf

Requires phone number VoIP

Advantages
New features and changes can be implemented more quickly.
Easier to get started with and to find contacts.

Disadvantages
Centralized services could be more susceptible to legislation requiring backdoor access.
Can include restricted control or access. This can include things like:
Being forbidden from connecting third-party clients to the centralized network that might provide for greater customization or better user experience. Often defined in Terms and Conditions of usage.
Poor or no documentation for third-party developers.
The ownership, privacy policy, and operations of the service can change easily when a single entity controls it, potentially compromising the service later on.