What should i use to unlock iphone 5?

I have an iPhone 5 on bell Canada and i moved to California. I don't know what happens but they are asking me to pay about 1000$ to unlock it which is way to much. I have jailbroken iPod before so i have a basic hack knowledge but i can't find the right software to unlock it.don't forget it still needs to be able to text and call on a new plan. I don't want to pay for the software.
iPhone 5
bell Canada
currently on ios 6.1

Don't pay a cent

I tried AndroidUnlock.us about a month ago, and it worked very well

Its free as well.

There are a lot of remote unlock service to have your phone iphone factory unlock in a cheaper price. There are unlock service which cost less than $20.