IPhone activation for iPhone 4s?

I just received an iPhone 4S from my family and a have an iPhone 4 I want to switch them. How do I go about that I activated it myself but you can't make calls on it. Also my iphone has no SIM card.

Take it to the carrier that you have and they can activate it for you

The iPhone 4S is still the best iPhone deal out there.
It does EVERYTHING an iPhone 5 does, at a fraction of the cost.

Check with your carrier, read them the MEID or the IMEI numbers to make sure it's free and clear for activation. If someone has a past due account or if the phone was reported as lost or stolen, then it can't be activated. DO THIS even if you know the person you got the 4S from. If you can't turn on the phone, the number is etched onto the SIM card tray.

Since you don't have a SIM card, you can't activate it until you do.
Go to your carrier's store and let them know what you have and that you need a SIM.
You'll have to buy the SIM, but afterward the SIM is yours to keep.
Install it and have the technician transfer all the information from your 4 to the 4S.
That way you'll not lose your contact emails and phone numbers.

Activate the new phone, deactivate the old one - there should be no charge for this.

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