Blocking a phone number on iphone?

I have a phone number that I would like to block on my iPhone but am wondering how I can without having to create a contact. I know I can if they have called me but what if I just want to block a number specifically without then calling texting or me making a contact.

I usually just go to recent calls, tap far right, then block. Thats a great feature, I use it all the time.

  • What does blocking a number actually mean? I've got an iPhone five and have a group iMessage with about 5 of my friends. Obviously when my internets not working or my 3G isn't on my iMessages go through as texts. One girl out of our group chat is going on holiday next week (abroad) so I really don't want to be accidentally sending her messages and causing myself to spend a fortune. Will blocking her number stop texts going through to her or just texts from her coming through to me?
  • Why isn't my phone number on tmobile updated to my other phone? How to fix message blocking error? I got this iphone from my dad because he got a new phone. He let me use my grandmas old line and I got a new sim card. I tried texting and then getting this Message blocking error, i went on tmobile and the phone number is still on my grandmas old phone, why isn't it updated to my phone
  • IPhone user blocking iPhone user? If I have an iPhone and I block someone else who has an iPhone will there messages send as text messages instead of iMessages? Or will they just keep sending as "delivered" iMessages no matter if my phone is on or off?
  • IPhone App for blocking a certain number? I want to block a certain number from texting me but I want to be able to go back in a week or 2 and turn the app off to see if they have tried to contact me. Or I would like an app that lets them text me but that I can't respond to them. Does anything like this exist?