TS4148 I'm trying to install a new SIM card in the iPhone 4 and it just says no service?

I've tried everything I can think of, I have to await a text from O2, however I can't get any service to receive the text.

You have to set up international use with Verizon.     Your phone is a CDMA version, which is a network type used in the USA.    The rest of the world is on GSM type network.  
Contact Verizon and have them set up your phone and out fit you with a SIM card.

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