Q: how to know if my iphone has been unlock?

In the US... on AT&T:

First: https://www.att.com/deviceunlock/client/en_US/

Then get response e-mail:

Request number: XXXXXXXXXXXXXXXXXXXXXXXXX

Thank you for contacting AT&T Customer Care about unlocking your AT&T Mobile device.

We have reviewed your request and confirmed that the device may be unlocked.

Please allow 24 hours upon receipt of this notification to complete the unlock process.

To complete the unlock, simply

1. Open iTunes on your Mac or PC and verify that you have Internet connectivity.

2. Ensure a SIM card is inserted into your iPhone.

3. Connect your iPhone using the dock connector to USB cable that came with your iPhone.

4. Backup and restore your iPhone using iTunes. For information on backup and restore, please visit http://support.apple.com/kb/HT1414.

5. After restoring, your iPhone will be unlocked.

Additional information on unlocking can be found at http://support.apple.com/kb/TS3198

For questions regarding AT&T Mobile device, please visit the Phone/Device Learning Center.

Thank you for your business. For other questions about our AT&T wireless service or other Mobile devices, please visit att.com.

Sincerely,

AT&T Customer Care Team

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Once you've followed the instructions this is what you'll see:

followed by

then

finally

and you're done!

******************************************************************************** *************

IF THE PHONE HAS SPACE PROBLEMS AND IT WILL NOT RELOAD THE BACKUP FILE, ERASE YOUR PHONE. You're going to use the backup you created anyway...

Thanks for the info! I've used your recommended site too.

The sites posted by seanachai51 appear to check the registry out there rather than the actual state of your phone.

I just requested an unlock from AT&T and got an acknowledgement, but haven't actually gone through the restore process, and iphoneimei.info says my phone is unlocked.

It would appear, then, that using another SIM is the only sure-fire way to know if the unlock actually succeeded (that and the "congratulations" message, maybe).

Just adding that the presence of the settings option, Cellular Data Network, found at...

Settings>General>Cellular>Cellular Data Network

would seem to be conclusive proof that a phone is unlocked (from AT&T at least), but this option did not appear while my AT&T sim card was still in the phone. So the iphoneimei.info site looks like the only resort if you don't yet have another sim card to put in.

Once the phone is unlocked, I did see that the option reappears, after swapping sim cards, without restarting the phone.

The most useful tip - Must try this way - thanks a lot NemeinWulf

HELP!!!

I just purchased an iPhone 4S to take overseas and use with a foreign SIM card.  I purchased from someone who unlocked it at contract expiration, which seems to be the case because every website I've checked lists the phone as unlocked.

When I put a friend's Verizon SIM card into this phone (which I presume isn't a Verizon iPhone), I am not receiving any telephone signal (all calls just fail).  Can someone just verify for sanity that a Verizon SIM will not work because it is CDMA while basically everyone else is on GSM?  I probably need to find a T-Mobile or AT&T card to test this.  Darn....

Thanks....

Yeah, if your unlocked phone is GSM, the only way to know for sure is with a T-mobile SIM (or some other lesser-known SIM -- like from outside the US). Verizon won't work because it's CDMA, and AT&T would work if the phone were still locked. I was lucky to find a friend with a T-mobile SIM to try.

Hello

Thank You for sharing the links to check your IMEI# I used the http://iphoneimei.info/ link

It came up and said:

Activated: Yes

Last Activated Sim: AT&T

Carrier: Unlock

Sim Lock: Unlocked

I know in one of the messages above if it says Sim Lock: Unlocked means your phone is unlocked  I was looking to buy this used AT&T Iphone 4S to replace the Sprint Iphone 4S that I have that Sprint will not unlock for domestic use even though my contract is up.

This is the status on my Iphone 4s using: iphoneimei.info

Activated: Yes

Last Activated SIM: Sprint - United States US

Telephone Technical Support: Expired

Repairs & Service Coverage: Expired

Carrier: US Sprint

SIM Lock: Locked

This information is correct.  I decided to do it on the AT&T Iphone I want to buy and it says

Activated: Yes

Last Activated SIM: AT&T - United States USA

Telephone Technical Support: Expired

Repairs & Service Coverage: Expired

Carrier: Unlock

SIM Lock: Unlocked

I checked the other site: http://iphoneox.com/ for the AT&T Iphone 4S I want to buy and it says:

This site shows something totally different which i know is wrong.  Which site do I believe. My phone status for this site is:

Since this is my phone I no its a Sprint Phone and its locked even though its out of contract.  I didnt use the other site S-urlo.ro as it was paid.  Before I spend the money i just want to make sure the sites are accurate.  I do not assume things.  The iPhoneIMEI.info looks like the more accurate site and several people in this forum use it.  

What do you all say.  Do you all think the AT&T Iphone 4S is unlocked.  Just curious what does it mean on the iphoneIMEI.info site when it says:

Activated: Yes

Carrier: Unlock

Thank You for your time and help

Michael

The only reliable way to find out a phone's lock status is to call Apple Care and ask them.

I unlocked my 5s and received a confirmation message on my iTunes interface stating phone had been unlocked

The other one iphone imei checker site: http://imei.org/.

Here is the result:

Model: iPhone 4S

Release: 2011, October

Colors: Black, White

Display: 640 x 960 pixels, 3.5 inches (~330 ppi pixel density)

Weight: 140 g

2G: GSM 850 / 900 / 1800 / 1900 CDMA 800 / 1900

3G: HSDPA 850 / 900 / 1900 / 2100 CDMA2000 1xEV-DO

Announced: 2011, October

Dimensions: 115.2 x 58.6 x 9.3 mm

Type: LED-backlit IPS TFT, capacitive touchscreen, 16M colors

Internal: 16/32/64 GB storage, 512 MB RAM

WLAN: Wi-Fi 802.11 b/g/n, Wi-Fi hotspot

Bluetooth: Yes, v4.0 with A2DP

Primary Camera: 8 MP, 3264x2448 pixels, autofocus, LED flash

Secondary Camera: Yes, VGA, 480p@30fps, videocalling over Wi-Fi only

CPU: Dual-core 1 GHz Cortex-A9

GPU: PowerVR SGX543MP2

OS: iPhone iOS 5.0, upgradable to iOS 6.1.3, planned upgrade to iOS 7.0

The report has one mistake - my iphone ios firmware is 7.1.

ALL IMEI checkers are scams. It's no surprise that there are mistakes in their "report". Note that all of the information you have posted is directly from the specs for the phone. There is nothing in that ersatz report that could not be determined from the model number alone.

@Lawrence Finch I agree with you. Almost site is using the GSX info, and it's is updating by apple. They can not keep update their database so that make some info is incorrect. But you can use their tool to check some helpful info before buy, sell or looking phone info. In my option i choose https://imeidata.net to check this info. 

For check simlock, activation status, find my iphone, model, color, storage, carrier and for model, factory, manufacturer date, order code, country, sold to.

Furthermore, one good thing site can do is check replaced device, I was use it to check some iphone replaced by apple center then they change to new IMEI, new serial number, that site give both original and replaced serial number. It might help you.