Description : I have 3 corporate SIM cards at my disposal, where ridiculous amounts are paid for called minutes and SMS. I lent 2 of them to my friends and one of them pays me late and owes me two months later. It's not a huge sum, but it is. Can I somehow block his number? (T-Mobile)
Last Answer : If you are the owner of the SIM card or an employee authorized to deal with the operator, you can block it.