One of my mobile phone cards is in arrears and useless for half a year. How is it deducted?

If it is a Unicom mobile phone card, I suggest you call Unicom customer service first to see if you can dial it, or use this number to log in to the online business hall or mobile phone business hall to see if there is any phone bill;

Because Unicom's post-paid mobile phone number is in arrears for three months (90 days), the system will automatically cancel the account and charge the pre-account cancellation fee: from the next month after the payment period 1 day, a late fee of 3‰ will be charged until the account cancellation date;

If your number has been cancelled and disassembled, please pay the arrears and late fees, and ask the owner to bring the original personal ID card to the local Unicom business hall to pay.