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