The carrier will also offer up to $350 per line to T-Mo subscribers to cover costs related to switching networks.
iPhone fans, you can still take advantage of carriers' hot deals, but see the new devices in person to ensure you're getting the right one, says CNET's Marguerite Reardon in this edition of Ask Maggie.
Like the carriers and other retailers, Target will offer the new iPhone for preorder on September 12 -- a week before it officially goes on sale.
As the iPhone 6 launch approaches, more trade-in sites are clamoring for your old iPhone. eBay is leading the charge with the promise of a $100 coupon if you can't sell yours on the auction site.
Now could be the best time to get the most buyback value for your old iPhone before the iPhone 6 officially launches and prices drop. Crave's Eric Mack has done some of the research for you.
Microsoft is offering MacBook Air owners up to $650 in store credit for trading in their Apple devices for its new Surface Pro 3 tablets.
And Verizon subscribers can save an additional $50 off a Galaxy S5 courtesy of a new two-week sale.
Through Sunday, customers who trade in an iPhone will get a gift card good toward an iPhone 5S or 5C. But as usual, the actual savings will vary.
In this edition of Ask Maggie, CNET's Marguerite Reardon asked the trade-in site Gazelle to offer some data about which smartphones retain their values best over time.
The carrier's new family plan model rewards customers who band together and guarantees at least $15 trade-in value for any phone.