I'm trying to take the sim card out of my Iphone 4s?

I'm trying to sell my iphone 4s. I already took out the sim card, and everything. Now when I turn it on, it still has my service. How can I uninstall the service? Because I can't cancel my service because I have a contract, I just can't afford a new phone. So I'm selling my iphone because I can go with out a phone for a while. I don't want to sell the iphone with my service in it, no way. I even factory reset the iphone and everything. It still has my service in the corner. Please help me, I'm trying to sell this as soon as possible for my school books. Please please please!

Added (1). I even tested it when I turned it back on, I can still make calls. Receive texts and everything. So please don't say I can't because I've picked up my phone to a phone call. & received many texts.

If the phone does not have the sim card in it there's no possible way to make calls off of your current service.

I Think it'll always have Your service provider up there since thats what the phones comparable with. Try making some calls or texts. Or is it with Verizon? I have an iPhone 4s with Verizon & it has a sim card for roaming. If it is you'll have to wait till the service gets cut off.

You are able to erase all the data on your iPhone including all of your media and information, and to default all your iPhone settings. This is particularly useful if you are selling your iPhone. Once completed you can plug your iPhone into your computer and use iTunes to restore your data and settings if required.

Connect iPhone to your computer or a power adapter. Choose Settings --> General --> Reset and tap "Erase All Content and Settings."

IMPORTANT: You can't use iPhone while data is being overwritten. This can take up to two hours or more, depending on the model and storage capacity of your iPhone.

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