Difference between unknown and blocked numbers in UK iphone?

What is the difference in receiving 'unknown' and 'blocked' calls on iPhone in the Uk?

Unknown means that they are unknown to your contacts, blocked means that they purposely chose for you not to see who they were and that you can't contact them back, you can do this by dialling 141 before the number

  • Will blocked numbers on my iphone stay blocked when I get a new iphone? My girlfriend blocked a number of a person she wasn't supposed to be talking to. She swore up and down she did. She got a new phone and months later that number called. Did she lie to me. She uses the same icloud account, the same phone number.
  • Unknown iPhone passcode set by unknown person? A passcode has been set on my iPhone without me knowing, now it is locked up. It says here to connect it to my computer and back up then restore my iPhone. Will this clear everything off my phone or will it be the same as it was before it got locked? I have only attempted unlocking it about 5 times in fear of disabling it. I do not want to back up then restore it if it will clear everything off and transfer it to the computer. Are there any alternatives to unlocking my iPhone?
  • IPhone app that blocks unknown numbers calling? What apps blocks unknown numbers on iPhones? I don't care if you have to pay I just want one that works well. I'm NOT going to jailbreak my phone for this either.
  • IMessage and blocked numbers? If you block someone from messaging you on an iphone, can the messages still come through on an iPad or iPod? If so, how can you block them COMPLETELY?