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If you bought your iPhone from someone instead of an official reseller such as Apple Stores and Apple's partners around the world, this could mean that your iPhone was unlocked through a jailbreak and once you upgrade the firmware you lost your jailbreak and your unlock. This means you'll have to jailbreak and apply an unlock so you can use your SIM card. I suggest you take a look at blog.iphone-dev.org and iclarified.com and look for tutorials on iPhone.
Hi, the PUK code is the security code for the sim card and not the phone, now when the sim card was new you would have been given the unique PUK code written on the card the sim card was attatched to.
if you no longer have this card then the only other place you can get this code from is your service provider, all you need to do is call them and give them either the phone number of the sim card or give them the number written on the back of the sim card, they will give you this code over the phone for free.
the other option you have open to you is if you dont need to use the sim card thats asking for the PUK code then you can go out and get another sim card and this will come with its own unique PUK code.
please dont try guessing the PUK code as it can be up to 11 digits long and they are totally random so guessing is beyond the question
let me know how you get on or if you need further assistance ok
please can you rate this solution, thanks
There is a small hole on the top of the phone near the lock button. Insert a thin strong object firmly into this hole. I suggest a paperclip or pin. This should cause the tray to pop out just a little so you can grab it with your fingers
Find somebody with an AT&T sim card, put it into the phone and plug it into itunes to get it up an running. Otherwise if your not using AT&T you're gonna have to jailbreak the phone to use it. If your a prepaid AT&T customer, you can activate it but you gotta call AT&T at 800 331 0500
The SIM card in the iPhone is removable, but it's hidden. To remove the SIM card, you need a paper clip.
We are checking to see if this voids your iPhone warranty. If you are concerned that it might, please don't perform this task.
The iPhone's SIM card is located behind this door. 1. Locate the SIM Card Slot
The slot is located at the top of the iPhone, between the headphone jack and the power button. The paper clip is a valuable tech tool. 2. Open the Slot
Take your paper clip and insert it into the little hole. Then firmly push down until the slot pops up. 3. Remove the SIM Card
The SIM card is in a cradle. You can pop the card out of the cradle.
To replace the SIM card, put the card back in the cradle. The cradle
and card are notched in a way that forces you to replace the card on
the proper side. Then just slide the card back into the iPhone.
The "insert sim" error is a common error. Usually it is caused from putting the sim in incorrectly.
Try this. If this is the one with the sim card ports that are on top of eachother than put the sim card in the port closest to the phone with the gold side pointing up.
Insert battery, turn on phone.
On the phone, go to the main menu. Tap phone settings. Tap dual sim settings. Tap to open sim 2. Go back to the main screen.
If that does not resolve go back to phone settings, tap dual sim settings, tap to open sim 1, go back to the main screen.
If this is the type of phone with the sim card ports seperate, insert sim with gold side down in either port. Go to phone settings, tap dual sim settings, tap open dual sims. Go back to main screen.
If this problem persists than either the phone or the sim is defective. Test the sim by putting it in a phone that belongs to the carrier the sim came from. If it works in that phone it is not the sim.