To disable spam block, dial #632# and to check your current spam block status, dial #787#. [2] X Research source Alternatively, you can download the Scam Shield app and enable “Spam Block” instead. You can also log into your T-Mobile app or the T-Mobile website and turn on “Spam Block” there.
Tap Block Caller to confirm. Once you do, that number will not be able to call you again.
The instructions for blocking with an Android vary depending on the manufacturer, but they are all very similar.