How to check the phone bill of the old man-machine

Call customer service for consultation. Older mobile phones need to check the remaining phone bill balance in their mobile phone accounts. You can call customer service. It should be noted that you need to know which operator your phone card belongs to, such as China Mobile, China Unicom and Telecom. After knowing which operator the calling card belongs to, you can call their customer service to check the phone bill. After the call, you will receive a short message, which will show the phone bill balance.