If you have Metro PCS Android, there are a few ways to block numbers. The first is to use the phone’s call blocker. This will stop all calls from that number for a set amount of time. The second way is to use the phone’s contact blocker. This will block all calls from that person, even if they are from another number. The third way is to use the phone’s blocked number list. This will list all numbers that have been blocked by the phone, and you can select which ones you want to call or email.