How to unlock my Iphone 4 ios 6.1 after jailbreak?

I've jailbroken my Iphone 4 ios 6.1 how do I now unlock it myself, can I use cydia for this?

I haven't used Cydia. So i'm not sure about unlocking through it. I recently unlocked my sister's iPhone 4 using remote unlocking service. This method of unlocking was very safe and simple. I got the remote unlocking service for the iPhone 4 from http://www.classicunlocking.com/apple-iphone-4/rs16wp9/ at affordable cost with free step by step unlocking instructions. This method of unlocking didn't require a jailbreak too. You too can have a try with this unlocking method to unlock your iPhone 4.

You should buy unlock services to unlock your phone forever.

http://rover.ebay.com/...=824&kw=lg

This is a service to Permanently Factory Unlock your Apple iPhone 3G 3GS 4 4S 5 - AT&T only. This Factory Unlock is a permanent unlock. You can update your iPhone iOS to the newest version and your iPhone will still be unlocked. It will never get locked again

Use the Evasion, which can jailbreak for all iOS devices including: iPhone 5, 4S, 4, iPhone 3GS, iPad, iPod touch 4G / 3G / 2G, untethered running iOS 6.1.currently available for Windows and Mac.
Learn more details information from here:
http://www.iphone-mac.com/how-to-jailbreak-iphone-running-ios-6.1.html