I got a call from a Mobilink number 03022654746 from someone pretending to be from PTA. In a commanding voice he started scolding me saying why haven't I registered my phone number with PTA. Note that both my phone number and mobile are PTA registered/approved. He said he is going to send me a code and I need to tell that to him to get my number registered, I refused and he threatened me with blocking my number within an hour. I hung up. The verification code he sent me via text was for the app IMO to get it registered on my number. God knows for what purpose or activities they plan to use these apps registered on our numbers.So guys beware of such calls, know beforehand whether your number and mobile phone are registered by checking with your network/DIRBS etc.