AT&T, T-Mobile retain top advertising crown, but U.S. Cellular is becoming a bigger threat

AT&T (NYSE: T) and T-Mobile (NYSE:TMUS) continued to be aggressive with advertising, accounting for more than 93.6 percent of the industry's digital response.

However, U.S. Cellular appears to be making a comeback on the wireless ad front. The wireless operator's ad with NBA star Russell Westbrook generated nearly 700,000 online views and more than 3,000 searches.

In partnership with iSpot.tv, FierceWireless takes a look what wireless carriers are dominating the advertising airwaves in its new feature on the top 5 wireless ads over the past 30 days.

Take a look at FierceWireless' feature here.