How to Unlock iPhone 5S/5C/5/4S/4 iOS 7.0.3?

I wanna know how to unlock iPhones on iOS 7.0.3? I have mobile shop and I have the below devices running iOS 7.0.3, so please let me know the best way to unlock them.

iPhone 5S on iOS 7.0.3 baseband 1.00.06 (Locked to AT&T)
iPhone 5C on iOS 7.0.3 baseband 1.00.06 (Locked to Australia Optus / Virgin)
iPhone 5 on iOS 7.0.3 baseband 5.02.00 (Locked to UK 3 Hutchison)
iPhone 4S on iOS 7.0.3 baseband 5.00.02 (Locked to UK O2)
iPhone 4 on iOS 7.0.3 baseband 4.12.09 (Locked to Canada Fido / Rogers)

In simple words, the best unlock solution for your iPhone is the Official iPhone Unlock using iPhone IMEI Unlock which unlocks your iPhone permanently.

"iPhone IMEI Unlock" method will allow you to update to any upcoming iOS version as your iPhones will never relocked again

How to Unlock iPhone 5S/5C/5/4S/4 iOS 7.0.3:

The below steps can unlock all your iPhone which locked to any carrier (AT&T, UK O2, Uk Vodafone, UK 3 Hutchison, Australia Vodafone / Optus / Telstra, Canada Rogers / Fido, Sweden 3 Hutchison / Telia / Tele2 / Telenor, Switzerland Orange / Swisscom / Sunrise, France Orange / Bouygues / SFR and etc.)

Step 1: You have to know the official carrier of your iPhone (the carrier which your iPhone is locked to)

Step 2: Send your IMEI (dial *#06# to get your iPhone IMEI) to the service provider to unlock it.

Step 3: Wait until receiving confirmation email that your iPhone has been unlocked.

Step 4: Finally connect your iPhone with iTunes to receive the congratulations message that your iPhone has been unlocked.

Important Note:
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There are many guys over the web claiming that they are able to provide iPhone IMEI Unlock service, many of them are scammers.

After deep investigation, we can say that iPhone Dev Team has recommended "My IMEI Unlock LTD" which has 5-stars rank on Google Products and I already unlocked my friend iPhones with them.

http://myimeiunlock.com/

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Some unlocking information for US Carriers:

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