How can I use my old phone if I have one?

I got it because my friend told me to get a phone that I don't use.

How can I use this if I want to?

Should I go to the carrier and sign up?

420 2017-04-03 Gentleman

I think you're saying that you want to change your phone from the one you used to get from your friend.
You can take out the USIM from your old phone and plug it into the phone you got from your friend.

Gentleman 8 years ago 0

A. 2

If you already have a USIM needle, you can plug it in.
It's not that, but if you got a phone without the one you used before, you can go to the carrier agency you want and sign up.

Gentleman 8 years ago 0

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