How To Put Phone On 3 Way Can You Put A '3' Sim Card In A Non-'3' Phone?

Can you put a '3' sim card in a non-'3' phone? - how to put phone on 3 way

I have a RAZR V3 phone on Vodafone I need to know is that I can then put to work to unlock my '3 'contract SIM? Thank you.