How to know if your iphone4 phone has a locked version or an unlocked version

Generally, after the settings are set, you can lock it when you change the card, and you can try to change the card.

Generally, if you buy it abroad, you can use it directly in China without a card, and it is unlocked.

There is a detailed explanation of the iPhone model on the Internet, you can take a look at the general - > settings of your mobile phone - > about this machine - > model, (that is, the operator below) and then check the number on the Internet.

See if the operator of your SIM card can be used.

Check the firmware version number.

Plug in the mobile card, if there is a signal it is unlocked.

Just ask the professional.

Trivial is by the trivial version. ,

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1. If it is a brand new and inactivated machine that you have just purchased, the easiest way is of course to go through the activation process. If it is activated with a Unicom card, the machine directly appears with the words "activation failed", then the machine can be concluded that the machine is directly a locked machine (the unlocked version of the Bank of China, the Hong Kong Bank and parallel goods all support Unicom).

2. When the new machine is successfully activated, the machine can be used normally. You can go directly to the "Settings" - "General" -"About this unit"-"Serial number"。

3. If you find that there is no corresponding letter, you may wish to connect the PC with the original data cable, open the i4 assistant, and after completing the connection, you can also see the area where the machine is sold. In this way, it can be determined whether the machine is the American version, and then there are the first few judgments of no lock or lock, and you can conclude whether this machine is the American version of the unlocked machine.

4. If the machine you are buying is a second-hand machine, it is actually very simple to push the machine to see if the machine has a lock. First open "Settings" - "General" - "Erase All Content and Settings", which is the easiest way to tell if the machine is unlocked.

5. After the machine restores the factory settings, all the settings inside the machine will be reset, including the black decoding data and the built-in card data, which will also be cleared. Repeat the activation process of Changyou, if the activation is successful, it means that the machine is an unlocked robot, and vice versa.

query locked and unlocked methods; Insert the mobile phone card of China Mobile or China Unicom into the mobile phone, and then go to "Settings - General - About This Machine - Carrier" in the mobile phone.

1. Unlocked machine: The operator is displayed as the operator + version number of the mobile phone card, and the version number will rise with the system upgrade or operator configuration upgrade. If the mobile phone is unlocked, the operator will display "China Mobile" + version number (<=) after inserting the mobile card, and the operator will display "China Unicom" + version number (<=) after inserting the China Unicom card

2. There is a locked machine: if there is no card assistance, the signal will not be sent out after inserting the card. But many locked phones do not see the card, there will be a signal after inserting the card, which will make people think that it is unlockless, in fact, it is because the card has been welded in the mobile phone, but it can be seen through the operator, if the operator does not display the mobile card or Unicom card after the unlock, it is usually locked, if the display KDDI, AT&T and other operators, it is a locked mobile phone.

3. The above is the situation that the card patch is not installed after the jailbreak, if the card patch is installed or the card is installed after jailbreaking, it will display China Mobile China Unicom, etc., the problem is that there is no such high operator version so far, and the operator will not change after changing the card, for example, the mobile card is China Mobile, and the Unicom card is replaced or China Mobile, so whether the card is inserted or not, as long as the operator displays China Mobile China Mobile and China Unicom, it is a locked phone.