Pardon, but you're completely lost. The service knows your mobile phone number because the app requires you to provide it in order to activate your Signal accou

Pardon, but you're completely lost. The service knows your mobile phone number because the app requires you to provide it in order to activate your Signal account. After you've provided your mobile number the Signal service sends you an SMS with a verification code, and the app asks you to enter that code. Your account is unusable until you comply with this procedure. Since the service is passing messages between users, those who run the service also know which people communicate with eachother - because a valid mobile number is tied to each and every Signal user account. I have no idea what you're rambling about regarding people having "reversee engineered the application". There's no reverse engineering required, as it's entirely open source.