Can you switch from an iphone 3 to an iphone 4 without using an upgrade?

I have a iphone 3 right now and an old i phone 4. I'm waiting till christmas to upgrade to the new iphone 5 is there any way i can get the service into the iphone 4, because the sim cards are different sizes, without wasting my upgrade?

Go to your service provider and ask them to switch sims. Its $20 i think.

You would have to use your upgrade since your using a newer generation.Id wait for the iphone 5. Try taking it into apple they may be able to transfer you sim cards info and exchange it with the old one.

No you can still wait to use your upgrade. I used another member on my plans upgrade and needed my own sim card. Go to your provider and tell them you need a sim card for that phone. Make sure its with you you'll need the esn/ etc.numbers.

You you can't switch an iPhone 3 to an iPhone 4 without using an upgrade

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