Sergio has a Metro PCS phone and he can't get any incoming calls. Leo says that he'll need to be sure he's giving out the right phone number - a digit could be mixed up. Verify what the phone number is according to the phone.
He might also have accidentally turned on call blocking in the settings.
Call forwarding may be turned on.
He should also try calling MetroPCS to ask. The port from another company may not have gone through properly.
Lastly, he should reset the phone. Start with a soft reset that requires removing the battery, and then go to a hard reset if it doesn't work. If he has Wi-Fi calling, he may not have set up his account with MetroPCS, which would prevent incoming calls.