Have updated my Samsung A51 to the latest version, and kept receiving a pop up to enter my contact number. I ignored it a few times but it was persistent, and finally input my number and clicked "continue". It led to nothing! I didn't think much of it until i woke up this morning and received 30 unknown messgaes and 4 calls from foreign numbers on Whatsapp. I never pressed any link nor have my number up everywhere, so i think it must that. Anyone facing the same?
