Many have been wondering about how to unlock iphone without SIM card. This is very easy to do. You will want to make sure first that you have the latest version of iTunes on the computer you are using. And then you need to sync the iPhone so that everything is up to date and all files are backed up on the computer. If you have not done so, you will also need to make sure that the phone has already gone through the jailbreaking process.
Once the phone is jailbroke, go to Cydia and locate the icon for unlocking the iPhone. A popular source is UltrasnOw. Click the settings or government button in cydia and follow the steps to “add source” which will allow you to add a URL. Use http://www.repo666.unltrasnOw.com for the source you are adding. This will store the site as a source in your iPHone.
Now you will need to update Cydia. Once the update is completed, press “return to Cydia.” This will take you back to Cydia where you will perform a search for UltrasnOw. Install the app and the iPHone will automatically reboot after it is installed. This program will unlock the iPHone. After it is unlocked, you can then insert a SIM card.