How long does it usually take for Vodafone to finally give service to my iPhone 4?

I bought an iPhone yesterday under Vodafone and was told by the salesperson to keep on switching it on and off in order for Vodafone to detect it. However, I've switched on and off for almost 10 times within the last 24hours. But it still has no service. I need the line because my current line is giving me problems and I can't contact anyone now. Thanks so much (:
 
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