IMEIDoctor.com is the best one providing official iPhone IMEI unlocking services. We offer cheapest and fastest service to unlock your O2 iPhone. Price just from £20 for iPhone 4/4S, £30-£35 for iPhone 5, 5C, 5S and £45 for iPhone 6/6+ (plus).
Our timeframe for this service is 1-15 working days, but normally it just takes only 3 days to get success! Once completed, your iPhone will be unlocked over-the-air, simply connect it to a Wifi or Cellular network and insert any SIM card, your iPhone will work well without any addition actions. Don't be surprised, we unlock your iPhone by submitting your IMEI number to your Carrier (O2 UK) and Apple to whitelist it from Apple activation database. So, you don't have to do anything except send us your IMEI number and wait for our works.
About O2 UK carrier
O2 was formed in 1985 as Cellnet, a 60:40 joint venture between BT Group and Securicor. In 1999, BT Group acquired Securicor's 40 percent share of Cellnet and the company was later rebranded as BT Cellnet. In June 2000 BT Cellnet launched the world’s first commercial General Packet Radio Service. BT Cellnet, together with BT Group's mobile telecommunications businesses in Germany, Ireland and the Netherlands were part of the BT Wireless division. This was spun off from the BT Group in 2002 to form a new holding company, mmO2 plc, which introduced the new "O2" brand for the businesses. mmO2 plc was subsequently renamed O2 plc. (Read more at Wikipedia)
How to unlock O2 iPhone 11 (Pro/Max), XS, XR, X, 8, 7, 6S, 6+ plus, 6, 5S?
It's quite simple with just 5 easy steps
Step 1: If you are sure that your iPhone is locked to O2 UK, you can skip this step. If not, please Check your iPhone carrier / network first
Step 2: From this page, you will see the product name (Here is O2 United Kingdom), and all details about your carrier. There is a big input in the left side, you should exactly insert your IMEI number and select your iPhone model. If you've inserted a correct IMEI number, your iPhone information will be appeared at the center segment.
Step 3: Once you confirmed the IMEI number and the iPhone model selected are correct, let click the "Unlock NOW" button. You will be redirected to the checkout page, you should provide your billing information here and click "Pay with PayPal".
Step 4: After received your PayPal payment and verified it's clean, we will change your order status to "Processing" and submit your IMEI to O2 UK and whitelist it from Apple activation database (You will be received an email for this change). This step may take 1-7 days.
Step 5: This is final step - Complete your unlock! We will send you an email with subject "Congratulations! Your iPhone has been unlocked". When you see that email, just simply connect your iPhone to a Wifi network and insert any SIM card, your iPhone should work instantly!
If it doesn't work, please try to go: Settings -> General -> Reset -> Reset network settings, then try again to connect your iPhone to a Wifi network and insert any SIM card.
(You will not lose your Jailbreak with 2 methods)
If 2 methods above are not working (Almost of cases happened if you are using iOS 6 or lower), then you have to connect your iPhone to Apple iTunes and restore it to latest iOS version