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T-Mobile does not offer this feature. This is typically something that you can do on your phone.
If you are trying block a specific number from calling you or prevent a phone on your account from being able to call a certain number, we do offer a service for $4.99/month called Family Allowances. This service will allow you to set up the blocking that you need through your online account Hope this helps.
Just wanted to check in and see if you were still trying to block a number! The suggestions above are both legit - as e2k mentioned, with a lot of current equipment, you can block numbers from your phone - and Chris is right, too, if you want to block a number through T-Mobile, Family Allowances is the way to do so. Were you able to get it taken care of, or can we help out? Let us know, we're here for you!