If i remove my sim card and put it into an old unlocked phone, will the old phone work instantly?

Or will there be a delay?
Needing to send my brand new phone in for replacement. Trying to avoid paying for a temporary phone provided by the manufacturer....

So if i just transfer the sim, does everything transfer immediately?

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ArishMell · 70-79, M

Note the cards are made in a few different sizes but you may be able to obtain an adaptor, like a miniature picture-frame, to hold a smaller card in a phone designed for larger.