This man is swapping sims to text me?

I was doing online dating and a man started talking to me and he started to get dirty to me and I blocked him a lot of times. When I say blocked a lot of times he has been changing sim cards to text me and call me in the UK. Is there a way I can fix this by telling someone or is there an option in settings or something to permanently block him. I have amn iPhone 4 running ios 7 and the latest carrier settings have been installed. What should I do?

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