Can anyone tell me: are all these accounts phone activated? I remember trying to setup multiple accounts on Twitter before (as a small experiment - I have too m

Can anyone tell me: are all these accounts phone activated? I remember trying to setup multiple accounts on Twitter before (as a small experiment - I have too much free time) and was prompted for my phone number, where Twitter would then send a code to my phone for verification. I only had one burner sim at the time to use for one dedicated account. So I imagine whoever is behind these info ops has a lot of sim cards to use exclusively for Twitter? It boggles my mind how these people manage to setup so many accounts. They have to be buying sim cards in bulk.