Why isn't my sim activation working?

So i bought a second hand Iphone 4 of my aunt and it is a vodafone carrier. I rang orange today to activate my sim card which had arrived this morning and they said that it was activated but the text messages that i was supposed to receive haven't come through. I was just wondering if the phone is locked and that's why they haven't come through or if it is because the activation hasn't occurred yet.

If it's not getting any signal, it's probably locked. But if you get signal and just unable to send / receive texts, there probably some settings missing. Full answers if you ask it here: https://www.facebook.com/...enseiPhone

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