I want to change some settings concerning restictions on my iPad, but I don't remember well wich code I have used. I have a few password to try, because I sure it is one of them, but I noticed that the device counts the tries I've already made. (2 for the moment). Will it be blocked as a regular sim card if I try a third times or It's just an information concerning attempts?
If you are talking about Parental Control type of restrictions on the iPad, I believe that to be entirely iOS software level. You have 6 attempts before it locks you out for a minute. It then increases the locked-out time after further failed attempts. Since you have two failed attempts, it should let you have four more without consequence, which, if one goes through, all is well, if not, you will be locked out, before you can do a 7th attempt for 1 minute - to start with.
If you fail the 7th time, it will increase the time to 5 minutes.