What do dial to block your number so they cant call back?

How do I block a cell phone number from calling me on my cell phone

I need directions on how to block a specific cell phone number from calling my cell phone.

It doesn't work...just get a recording stating "we're sorry we can not accept your call as dialed"

There is this girl at my school that somehow got my cell phone number. I need help, I want to know how to block phone calls f...

how to block my cellphone number through in computer?

someone keeps calling my cell phone and blocking there number, how do I stop them from calling me?

How can you find a blocked number that calls your husbands cell number

Okay so my sister got this number from this mexican, so I called him on my cell phone, not thinking to block my number from h...

I have Verizon and Verizon Wireless. How can I block a certain number from calling me?

How do I block a number from calling my mobile, telstra