will54880 said:
Just curious if AT&T views porting your number to a different carrier within the 30 day trial the same as cancelling service.

It is treated the same with regards to cancelling within 30 days. Oftentimes it does require manual adjustment to the final invoice - I see a lot of cases like that where the bill system automatically charges the ETF. If that happened, you'd just have to call customer care and they'd remedy the situation.