How to block phone calls and texts from a certain number on iPhone?

I'm currently feeling incredibly let down by both my phone manufacturer and my network provider. I'm using an iPhone 3GS and I'm with O2 and have been for many years.

I have been informed by my network prover that 'there's absolutely no way to block numbers on iphone unless you find an app that works'.

Having done some research on the Internet and the app store, I have found that the only app that works is iBlacklist. However, this only works with jail broken iPhone's. I do not want my iPhone to be jail broken. Other than that, the few apps I have found do not appear to work from the reviews I have read, and are also charging around £1.49 for a non existent service.

Another option I discovered was that I could register with a 'do not call' service. However, I begrudge having to pay monthly just so that I can block one person from contacting me.

I feel that my only other option is to change my number which I'm also reluctant to do. Why should I have to be inconvenienced and potentially left out of pocket just because of one persons constant attempts to contact me?

I hope that someone is able to help me with my querie.

The only way you can block that person is to go to the store and they should be able to block the number for you. Because i had that problem

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