Samsung is giving away a 32GB Samsung Galaxy S6 on the wireless carrier of the customer's choice with the purchase of one of a range of 4K TVs. Buyers more interested in the S6 Edge, which curves the screen around the sides of the phone, will have the option to ask for a $400 discount, around 50 percent of the current cost.

The announcement follows reports that sales of Samsung's flagship device are flagging compared to the iPhone and S6 Edge. Samsung expected the S6 to sell better than the S6 Edge, while they are actually close to being on par. This has left Samsung with a glut of devices it needs to shift, while company sales are expected to decline 8 percent year-on-year in the quarter ending in July.

The offer is valid for customers in the US purchasing the JS9500, JS9100, JS9000, JS8500, JS850D or JS8600. The JS8500, the cheapest of the group, is available in 48 inches from Samsung for $1,499.99. This is the cheapest way, purchasing from Samsung, to take advantage of the offer.

The promotion is running until September 1, 2015 at midnight ET. Customers who have purchased the set will need to go to Samsung's website and submit a valid offer claim form and receipt. No matter which phone the customer goes for, it'll have to be on either Sprint, T-Mobile, AT&T or Verizon.

The S6 and S6 Edge bring a new look to the Galaxy range, offering up a more premium metal and glass body compared to its polycarbonate predecessors. The screen has a tougher glass, and a new in-house processor means critics are praising the Galaxy S6 for making some dramatic changes to the lineup.

However, reports emerged earlier this month that while main competitor Apple used to split the smartphone market profits with Samsung evenly, Apple has raced ahead claiming over 90 percent of smartphone profits.