How does end-to-end encryption work in a messenger service, and is my data truly secure?
What are the key differences between SMS and app-based messenger services in terms of functionality and cost?
How does a messenger service handle multimedia files, and what are the limitations on file size or type?
Can I use a messenger service across multiple devices simultaneously, and how does synchronization work?
What options are available for customizing notifications and privacy settings in most popular messenger services?
