Question: 
I bought a used iPhone from someone and found out that I can’t use it because the iPhone’s IMEI is blocked/barred by my Australia iPhone Vodafone or 3 (Hutchison).
How do I change or edit the IMEI to unbar my blacklisted iPhone? Is there anything I can do at all?
Answer:
Technically, there’s no tool or method available to change your IMEI. Once it’s blocked by your service provider, you won’t be able to use it anymore.
You might want to call or make an appeal with your service provider.
If that doesn’t work, this service offers chips replacement which will change the IMEI of your iPhone. Potentially it will allow your iPhone 4 to be used on your network of your choice again.
For Australia-based iPhone users, this service will clean your IMEI but only Australia Vodafone or Three network are currently supported. There’s also an eBay service right here.
Question:
I bought a used Verizon/Sprint iPhone online and found out that I can’t use it because its ESN/MEID is blocked/blacklisted. How do I fix the bad ESN?
Answer:
Technically, there’s no tool or method available to fix your bad ESN/MEID.
Once it’s blocked or blacklisted by your service provider, you won’t be able to use it. The ESN/MEID needs to be cleaned first.
This service will clean your bad ESN/MEID for Verizon or Sprint iPhone only.
Question:
I bought a used Verizon/Sprint iPhone online and found out that I can’t use it because its ESN/MEID is blocked/blacklisted. Can I jailbreak it to change the ESN/MEID?
Answer:
Technically, there’s no tool or method available to change your ESN/MEID.
Once it’s blocked or blacklisted by your service provider, you won’t be able to use it. The ESN/MEID needs to be cleaned first.
This service will clean your bad ESN/MEID for Verizon or Sprint iPhone only.
Question: 
Can I downgrade baseband 4.12.05 to 1.59.00 without SHSH blobs?
Answer:
The notion of SHSH has gained importance since the arrival of iOS 4.x.
Do not get confused between the SHSH for iOS with downgrading your baseband as these two are totally different entities.
You can always downgrade your iOS if you have saved your SHSH before, but baseband can never be downgraded no matter how. This is due to a complex security system called BBTicket which was implemented by Apple that prevents any attempt to do downgrade iPhone’s baseband.
So back to the question, can you downgrade baseband 4.12.05 to 1.59.00 without SHSH blobs? The obvious answer is no.
The best way is to get it officially unlocked using this service or here.
Question:
I bought a used iPhone from someone and found out that I can’t use it because the iPhone’s IMEI is blocked/barred by my service provider.
How do I change or edit the IMEI to unbar my blacklisted iPhone?
Answer:
Technically, there’s no tool or method available to change your IMEI. Once it’s blocked by your service provider, you won’t be able to use it anymore.
However, this service offers chips replacement which will change the IMEI of your iPhone. Potentially it will allow your iPhone 4 to be used on your network of your choice again.
For UK-based iPhone users, this service will clean your IMEI but only EE, T-Mobile and Orange network are currently supported. There’s also an eBay link which is 100% legit.
Question:
I have an iPhone and how do I fix blank baseband, IMEI, WiFi and Bluetooth?
Answer:
This is a hardware issue – usually a combination of a defective or corrupted baseband processor chip and Intel/Numonyx/Spansion NOR chip, baseband SRAM chip, UMTS Transceiver IC or broken micro components.
This usually happens after doing a restore, or a forced baseband update to 6.15.00 using redsn0w. In a more recent case, flashing iPad baseband will cause this problem due to a new Toshiba chip used in iPhone 3GS.
Only hardware fix is possible at this stage.
Question: 
How to update to iOS 6 and preserve my iPhone baseband?
Answer:
The reason why you would like to preserve the baseband so that you can unlock your iPhone either with ultrasn0w or Gevey SIM.
Currently, tools or methods are still being developed.
Sn0wbreeze and redsn0w are the primary tools to build custom firmware that can preserve your iPhone’s baseband.
Be sure to join our Facebook page to get the latest update on how to preserve your iPhone baseband to install iOS 6!
Question: 
How to unlock AT&T iPhone 5 on iOS 6 baseband 1.00.16?
Answer:
If yours is locked to AT&T, potentially it can be unlocked for free. Follow the steps below.
STEP 1: On your iPhone go to Settings > General > About and write down the IMEI number.
STEP 2: Call AT&T at 1-800-331-0500 (Skype users can call for free).
STEP 3: They will ask for various information and will specifically asked for your IMEI number.
STEP 4: They will email you within 24-48 hours stating your unlock is ready or not. In some cases they will give you a case number.
STEP 5: The email will tell you exactly what to do to unlock your iPhone.
Alternatively, you can also send an email to icare3@amcustomercare.att-mail.com with your IMEI number and asking them nicely that you would like it unlocked.
If all fails, you can factory unlock it forever using this service.
Question:
I set restrictions password on my iPhone to disable in-app purchases so that my children don’t rack up a bill on my account. Unfortunately I’ve forgotten the password. How do I reset it?
Answer:
Thankfully, there’s a way out.
1. Backup your iPhone on iTunes.
2. Using iBackupBot, open the backup folder and go to Library/Preferences/ and open the following file:
com.apple.springboard.plist
All that you need to do is to turn off restrictions. Look for SBParentalControlsEnabled and then Change the <true/> to <false/> in the following lines:
<key>SBParentalControlsEnabled</key>
<false/>
3. Save the backup and restore from iTunes.
Question:
How to unlock AT&T iPhone 4 iOS 5.1.1 baseband 4.12.01?
Answer:
If yours is locked to AT&T, potentially it can be unlocked for free. Follow the steps below. If it’s locked to other carriers, use this.
STEP 1: On your iPhone go to Settings > General > About and write down the IMEI number.
STEP 2: Call AT&T at 1-800-331-0500 (Skype users can call for free).
STEP 3: They will ask for various information and will specifically asked for your IMEI number.
STEP 4: They will email you within 24-48 hours stating your unlock is ready or not. In some cases they will give you a case number.
STEP 5: The email will tell you exactly what to do to unlock your iPhone.
Alternatively, you can also send an email to icare3@amcustomercare.att-mail.com with your IMEI number and asking them nicely that you would like it unlocked.
If all fails, you can factory unlock it forever using this service.
