Does anyone know how to disable call barring on a LG K7 phone that is unlocked from MetroPCS who has absolutely no information or tech support and their clerks are useless at my local store.

I am in the call barring screen and when I click on disable call bearing it want me to enter a password pin - I don't have a pin - this is an old phone. It was recovered to factory settings to no avail.

Any help would be VERY much appreciated.