Unlock Lumia 635 AT&T GoPhone

My Lumia 635 is locked to AT&T. The phone does not have a contract, so I am eligible to unlock it from the AT&T website but there have been some issue with teh site, and my unlock request is still being processed for a long time.

So is there any way to hack/unlock it so that I can use it in a locked sim network for free?

Thanks