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Galaxy S9 trade-in deal: AT&T offers $150 in bill credit, $350 for your old phone

Bring in an iPhone X or Google Pixel 2 to AT&T and you can get $350 off a new Galaxy S9.

Samsung Galaxy S9 and S9 Plus

Galaxy S9 and S9 Plus.

Sarah Tew/CNET

AT&T is offering some pretty decent incentives if you're looking to get a Galaxy S9 or S9 Plus.

Starting Friday, preorder Samsung's latest flagship phones and you'll receive bill credit worth $150 from AT&T. There is a caveat though: You'll need to bring in a new line from a competitor to get the credit, meaning existing AT&T users will miss out on this deal.

On top of that, you can receive up to $350 of credit if you trade in your previous phone. Not all phones are equal, of course. Here's the guaranteed minimum when trading in certain models:

AT&T isn't the only place offering deals with the Galaxy S9 family. Retailer Best Buy is offering $100 off when you preorder, and customers can combine that with a $350 trade-in offer as well. Xfinity Mobile is offering up to $450 in discounts, which includes a $250 prepaid Visa card.

In general, the S9 retails for about $720 and the Galaxy S9 Plus starts at $840, depending on where you buy it. Such discounts can mean saving a notable amount of money for the premium phones. For more, read CNET's breakdown of US pricing for the Galaxy S9.