How to jailbreak a iphone 4s?

I accidently upgraded to 6.1.3 a while back. Now I need to unlock the phone by jailbreaking it since it is a bell iphone. The cost of unlocking a bell iphone is ridiculous. Is there any hope?

Added (1). Can I downgrade somehow?

Nope. Sorry.

No SHSH blobs, no downgrade.

Actually, you can jailbreak it yourself or use a guided tutorial and software. To make use of your phone's full functionality, you can find instructions on a website

http://www.iphoneunlockwiz.com/how-to-jailbreak-iphone-4s-quickly-and-easily/