I’m pretty sure if I accidentally press “OK”, I get charged extra. In addition to the pop-up, I get the same thing as a permanent notification until I reboot – if I try to disable the notification, I get “These notifications can’t be modified”, as it is using the built-in system SIM Toolkit. I am using GrapheneOS. Name and shame: MOVISTAR.
Damn. I get mad at the normal text messages sent by Tmobile; but I can at least block the number and label it as spam. This would make me go with a different carrier even if it wouldn’t have the same coverage area.