How to i use an att sim card with this ipad - Apple MD523LL/A 32GB iPad with Retina Display Wi-Fi Verizon - Black

If you have adopted a used iPad, I suggest that you perform a complete restore. This will give you a fresh and clean iPad to which you can register your own Apple ID. You will not be able to keep the contents on the iPad as you received it, but you will be able to enter your own ID.
Good Luck
Use iTunes to restore your iOS device to factory settings

If your Ipad is a 3g enabled option then go to the follwing link for instructions: Remove the SIM card from your iPhone or iPad instead of removing it you just put it in.

first:
are you sure you really have an iPad with SIM-slot?
Remove the SIM card from your iPhone or iPad

There is no such thing as a free imei unlock code. If you need to unlock the sim in your iPad. (imei is connected to they Sim card) you can ask the provider to give you a new sim card with the same number. the new card has a new imei, new pin and new Puk.

Your iPad 2 must have 3G, with a sim card. For the sim you need the pin and after 3 misses you need the puk. The puk is on the letter or card that came with the original sim card. On that letter is the pin and puk. sometimes you have to scratch away the metal layer.

If you want to unlock an iPad, with the lock code on, and forgot your pass code you have to enter the correct password that belongs to your Apple ID. It will be partially on the screen. If you really messed up, setting up security, and lost unlock code and your Apple ID password. Only Apple can help. For that you have to take iPad, invoice, Prove of your identity (Passport) to the Apple store and hope they will unlock your iPad. With iOS7 Apple mede a very good security system. And while setting up the iPad and the security, you are warned several times what to do t make sure you and only you could enter the system.
Be aware if Apple does reset your iPad, all data now on the iPad will be lost.

http://www.ifixit.com/Guide/iPad+2+GSM+Headphone+Jack+%26+SIM+Slot+Replacement/6159

Follow Step 1 and 2 only.
Note: If you bought the wifi-only iPad then it won't have a sim card slot, if you bought the wifi + cellular version then it should have a sim card slot on the left-hand side towards the top

If you purchased the 3G version,yes it will need SIM card.SLot is located on side of iPad.

Yes! It is possible to unlock iPad (or other iOS devices) now. And if you prefer an easier way to get the job done, see how you can achieve it on your PC or Mac on your own from this website: automaticiphoneunlocker.com

It may be a case of wrong cutting of the micro sim. Since the iPad uses a microsim, you haveto make sure that the sim card is cut perfectly. Do not use a pair of scissors, you have to cut it specifically using a micro sim cutter. Or you can check if the placement of the sim card is correct. Sometimes, the card seems to get loose thus making it unreadable by the iPad.

Hi sir

Here The Sim Card Slot On The Ipad