Comment by Fokamul
Using any mobile phone connected to mobile network is breach of OPSEC, period. Even more in countries, where you cannot get anonymous SIM card.
Not using phone numbers in chat app doesn't protect you against someone locating you.
When phone is turned on, even without SIM, your location is saved, in inches. Thanks to 5G.
And some phone turns itself on automatically, lol.
Using laptop (without any wifi card) -> Wifi card (rotating fake MAC) -> wifi network/LTE modem with IMEI spoofing
Agreed, but people are going to people and will use phones, anyway. Might as well not include identifying information during registration.
Signal is a desktop app, as well. Even if you wanted to run it on Qubes in a Faraday cage, you'll need a phone number to register to use the app.
In the ideal situation, no one would be using Signal, phones or computers, the design of the internet is inherently identifying and non-anonymizing.