What should I do if the US version of iPhone 4 is locked?

Steps:

1. Be very careful during the hands-on process, and cut off another piece of the already small SIM card. The handy tool is a nail clipper. If you are confident in your DIY skills, sharp scissors are also an option.

2. After cutting the card, place the card sticker on the card slot, paying attention to the black circuit block facing up, and then place the cut SIM card on it. There’s no rush to put it on your phone now.

3. Turn off the phone and then turn it on again. When the screen lock appears again, quickly open the screen lock and push the installed card slot into the phone. (Please remember to cancel the lock screen password, because it will be too late to unlock the screen and cause failure)

4. Wait patiently for a while, the GEVEY card will pop up a dialog box, which will tell you how to unlock the card. , you can take a serious look at it. After clicking OK, wait another 15 seconds to proceed to the next step.

5. If you missed the previous step, don’t worry. You can go to Settings>Phone>SIM Card Application Menu and wait for a while, a prompt will pop up. If not, you can shut down and restart.

After 6.15 seconds, you will switch to the dialing page, dial "112", and hang up immediately after the call (within 2 seconds). At this time, the screen will be stuck on the dialing page for a while. Then it will return to the normal dialing interface. (Tips: Don’t be too hasty to call 112, as early failure may easily occur. Be patient and wait for a while, even a little longer than 15 seconds.)

7. At this time, open the phone settings Option, turn on airplane mode, and then wait for about a minute. A prompt will pop up saying that the SIM card is not installed. Ignore it and turn off airplane mode.

8. Finally, a SIM card failure prompt will appear. Continue to ignore it and wait patiently for dozens of seconds before the signal appears. The bricked machine was saved.

After using the card sticker, both China Mobile and China Unicom cards can be used normally, the network function is normal, the 3G function is normal, and the call function is normal. In short, all functions can be used normally.

Notes:

1. If an "operation failed" message appears, or there are circumstances not mentioned above, please turn off the phone immediately, take out the card sticker, and start over.

2. If it keeps failing, please check whether there is contact between the card sticker and the metal part of the SIM card chip. If unfortunately there is contact, you need to replace the SIM card and start over. Sometimes, even if there is no contact, the problem will continue. If it fails, there is about a 1 chance that there is a problem with your SIM card itself. You can try to replace the SIM card.

3. Because it is a card sticker unlocking, international text messages will be sent when FaceTime is registered. If you want to use this function, you have to go to the business hall to activate the international text messaging function, and when registering, international text messages will be sent. There is a delay in sending.