How to unregister iphone before selling it

I recently purcharsed an iPhone 4.
I'm going to sell my iPhone 3Gs. How do I format and unregister the phone (i.e. erase all the data in the phone)?
Thanks for answering

beedoola wrote:
Do you need to unlock the phone before selling it or will the erase method above do that? I have an ATT iphone 4. Do I need to unlock it if the buyer is going to use it with ATT or Tmobile?
Only ATT can unlock the phone if it's going to be used with T-Mobile

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How much is iPhone before and after taxes?

how much is iPhone before and after taxes? I am from the Philippines and I am just wondering buying it online with my credit card. i know that it costs $399 for 8GB and $499 for 16GB.

I bought mine day one, so the pricing isn't the same anymore.
As for the one your Aunt buys, she will pay either $399 or $499, depending on model, plus applicable CA sales tax, which I do not know.
Keep in mind that you will not be able to activate your phone in the Philippines in its virgin state. Keep in mind as well that currently there isn't a good way to "devirginize" a 1.1.3 iphone.

How to delete the files from iPhone before selling?

How do I delete the files from my old iPhone4 before selling?

Hey adhot,
Before selling your iPhone, you'll want to follow these directions:
Before you sell or give away your iOS device, make sure that you have removed all of your personal information. Follow these steps to protect your data and get your device to its factory default state for the new owner:
Back up your device.
Go to Settings > General > Reset, then tap Erase All Content and Settings.
This will completely erase your device and turn off iCloud, iMessage, FaceTime, Game Center, and other services.
If you are using iOS 7 and have Find My iPhone turned on, your Apple ID and password will be required. After you provide your password, the device will be erased and removed from your account so that the next owner can activate it.
Contact your carrier for guidance on transferring service to the new owner.
When the device is turned on for the first time by the new owner, Setup Assistant will guide them through the setup process.
Important: Do not manually delete contacts, calendars, reminders, documents, photo streams, or any other iCloud data while signed in to your iCloud account, or the content will also be deleted from the iCloud servers and all of your iCloud devices.
via: What to do before selling or giving away your iPhone, iPad, or iPod touch
http://support.apple.com/kb/HT5661
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HT201328 How to unlock iphone before you get a new sim card?

I read the article on unlocking the iphone 4, and got permission from the carrier to unlock it. But the instruction assume you already have a 2nd / diferent sim card. How do you unlock the iphone before you get a new sim card? I.e, as in unlocking it before going overseas where you will purchase a country specific sim card?
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I restored my AT&T locked iPhone without a different sim, & got the congratulations screen. So, do this:
1. Sync your phone to create a current backup.
2. When finished, hit the "Restore" button.
3. When done, you should get the "Congratulations" screen.
4. If you do, restore your phone from the backup you made when you started.
5. Sync your content back to your phone.
That's it. You're done.

HT1147 I"m selling my MacBook Air. How to clean out before selling?

Hi Communities,
How can I clean my MacBook Air memory before selling it?? hard drive or whatever.

Boot into recovery mode, select Disk Utility, erase the HD, using the zero out data security option, quit DU, and reinstall the OS. On first boot, quit the Setup Assistant, and sell it in that condition to the new owner.

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Hello,
I am helping someone out with their Iphone 4 which they have been using for 6 months or so without registering it. They
need to register it to their computer now. I am worried that by registering the Iphone all of the contacts on the phone will be wiped!
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Hello,
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How to deactivate before selling on ebay

I have an active 16 gb iphone 3G.
How do i deactivate phone and all info on my iphone before selling it. I ordered a new Iphone 3G S and want to sell the 3G before I get the new one.
thanks

Your iPhone 3G won't be deactivated until your iPhone 3GS is activated, but you can remove the SIM card to accomplish the same.
On your iPhone, go to Settings > General > Reset, and select Erase All Content and Settings. This is a secure erase and will take a couple of hours or so. You should connect your iPhone to a power source when doing this.
When the process is finished, all existing content and settings on your iPhone will have been securely erased.
Remove the SIM card and you are done. You may want to contact AT&T at the same time to let them know you are selling your iPhone 3G before your iPhone 3GS is activated.

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please help me.
does anyone know how to restore iphone before activation?

Hold down the home button while connecting to the dock.
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I will be selling my Imac G5 which was synced to my mobile me account. I know I can "unregister" the computer before selling but I want to make sure I securely erase my data for all the programs I have.
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Skip

I don't know why you've posted this in the iSync forum (which is for syncing non-Apple mobile phones via a USB or Bluetooth connection), but anyway...
Here's an Apple Support document on zeroing all the data on your hard disk:
http://support.apple.com/kb/HT1820
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http://support.apple.com/kb/HT1212
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How to unregister iphone before selling it

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