guys,
I have an iphone 4, version 5.1 (9B176) with modem firmware 04.12.01, which i tried to unlock, only to find out that it has to be "factory unlocked." Are there any websites that provide free imei unlock codes?
Any help would be really appreciated. 

 @Quarterback What is yur iPhone carrier ? and where are you right now ?? there r many sites they can unlock factory unlock your phone for less then $ 10 . 

2 options 
Option 1: IF you meet these requirements get it unlocked from att 
● A current AT&T customer or a former AT&T customer who can provide the phone number or account number for the account ● The iPhone was designed for use on AT&T's network ● All contract obligations, including any term commitment, associated with the device to be unlocked have been fully satisfied ● The iPhone has not been reported lost or stolen.

https://www.att.com/deviceunlock/client/en_US/

Option 2 : from ebay for less than $10 ...i recommend UnlockFusion
http://stores.ebay.com/UnlockFusion

 

HI no free unlocking service are unavailable for iphone so  better unlock it using reliable online providers ...I will recommend you to visit TheUnlockSpot.com here they are rendering remote unlocking service to unlock all model iphone from network lock .You first verify that whether they are rendering service for your country and network provider .If yes then pay for it and unlock your iphone 4...