How do I unlock my iphone or reset it from a sim lock

Forgetting mobile phone password is a common situation. However, there are several ways to reset the password. Just follow below steps to do that.

If you have synced your iPhone with iTunes before you forget your iPhone password, you can reset your iPhone by using iTunes without losing data. Through iTunes, you can restore your iPhone from the last backup and remove the passcode from your locked iPhone while retaining your data. If iTunes asks you to enter the passcode, try another computer. Otherwise, you have to follow the reset iPhone Passcode with Recovery Mode section below. The following steps will show you how to reset iPhone password with iTunes.
Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it and follow prompts to choose the latest iTunes backup to restore your iPhone.

After the restoration process is complete, your passcode will be erased and all your data will be restored from your backup. You will now be able to access your iPhone without any passcode. And you can set your new password on iPhone.

For more methods, check: How to Reset Password on iPhone

In iOS10 how to use easy way to unlock the screen
If you want to use the slide way back to unlock iPhone screen, here's the steps for you to follow.
You should check if your device meets the condition. That is, your iOS device must have Touch ID-enabled feature. Including iPhone 5S, iPad Air 2, iPad Pro, iPad Mini 3 or other later devices.

If the iPhone is disabled, the only way to unlock it is to completely erase and reset it. If you have a backup, you'll be able to restore it, otherwise you'll lose all of your data. There is no way to unlock a disabled iPhone unless you use the correct passcode or you erase it. The following guidance will show you how to unlock a disabled iPhone with iTunes.

Step 1. Connect your iPhone to the computer with via a USB cable that your iPhone has trusted.
Step 2. Launch iTunes. If you've synced your iPhone with iTunes, then no "enter password" is required.
Step 3. iTunes will automatically sync your iPhone and create a backup file. If it doesn't, you should sync your iTunes and create a backup file manually by clicking "Back up Now" in the Summary window.
Step 4. In the Summary window, you can see the option "Restore iPhone". Click it to reset your iPhone. Once the reset process is complete, you'll be taken through the iPod's initial setup process.
Step 5. Select "Restore from iTunes backup" during the setup process. This will load the backup that you created so that all of your data is restored.

How to Unlock Disabled iPhone with without iTunes

Well, if you forgot the screen lock password for your iPhone, you will have to reset the iPhone to factory settings and then set up a new password. But the factory settings of iPhone will lead to the data loss in your iPhone, as iPhone doesn't save contacts in the SIM card, so you may lose contacts and other data when resetting iPhone. So before doing that, you will need to back up your iPhone data to computer.

iTunes won't be helpful on this issue. When your iPhone is locked, iTunes can't recognize the device. So you will need third party software to help. If you want to backup the contacts, messages and so on, I suggest you use iOS Data Recovery.
http://www.leawo.org/tutorial/how-to-backup-locked-iphone.html

Here you go everything you need to get you out of the mess :)
http://www.everymac.com/systems/apple/iphone/iphone-troubleshooting-repair-faq/iphone-how-to-unlock-open-forgot-code-passcode-password-login.html

try this link

To recover a locked iPhone iOS Forgotten passcode or device disabled after entering wrong passcode

you will need the computer that was originally installed iTune to unlock it. or you will need to contact your plan carrier to reset it for you

No Sim Card Installed Insert a valid Sim with no pin lock

my phone was has problems with itunes asking me for the oreginal sim but how am from africa where can I get this sim from here, pls help!!!