How to make a 3 way call on a iPhone 4?

I want to talk to my 2 best friends on my moms iPhone 4 but I don't know how. I also want them to meet each other on the phone.

Call your first friend, when she picks up say hold on, then call the next while still on the other line, and then when she connects you should be able to join all three calls if not automatically it should give you the option.
But YOU have to call both people.

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