How do i change carrier on iphone 3? phone was unlocked

I have a iphone 3 that i want to switch over to another network. i have the sim from other network and the phone is unlocked, but cannot find how to change the carrier network over. anyone able to help?

You need to swap the SIM.
The SIM is stored in a little pop-out tray on the top (IIRC) of the iPhone.
There was a 'SIM Removal Tool' inside the box your iPhone came in but you may be like 99% of the rest of the population who discarded or otherwise lost the tool, in which case a pin or paperclip might be an alternative.
Pop out the tray (using either the Tool or a pin), swap the SIM and re-insert the tray and you should be good to go.

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