How do i undo the "Don't show this again" on messages

[AC Question]

So i've recently tried to send a messege to my mobile network, wanting to know how much money do i have on my account. The number was a 5 digit one, and it asked me something like you would like to send a message to 13880, this could lead to extra expenses. And there was a tickbox which said "don't show this again", which i accidentaly clicked. Now i can't send message to any 5 digit number. I am using Samsung galaxy S7 Edge, Android 6.0.1. Help please.1

 

[H3aTeRzz]

I'm afraid that you will have to contact your mobile carrier for that answer.