Porting to TMobile

I am currently in a 2 years contract on 2 phones. I am porting to Tmobile. Is there a way I can get my phone unlock before my account is closed with att? I know that I am supposed to be charge for ETF. I was told that with my grandfather unlimited data changing to $35 I would be able to cancel without ETF. Really when my cycle ends at the end of the month, I should really don't have any charges and no ETF. Would ATT be able to unlock me early, so I don't have any downtime when the porting is done.