First buy a USB WiFi compatible with any sim card and also compatible with tails, the sim card must be bought from countries that do not require ID and are completely anonymous, usually they can be charged on some platforms with bitcoin and you have good and quite a lot internet with vodafone in roaming, Then pay the label with prepaid card which can also be bought with crypto, more you can find in the vendor's bible somewhere on the internet ,you can download it, and don't forghet to use gloves and hire a midleman :-/