US wireless carrier Sprint has decided to abandon a bid for rival T-Mobile, viewing the massive tie-up as unlikely to win regulatory approval, the Wall Street Journal reported. Sprint, which is controlled by Japanese giant SoftBank, had been close to a deal valued at some $32 billion, according to several reports. The Journal said on Tuesday that Sprint gave up after officials from the US Justice Department and Federal Communications Commission indicated they would oppose a deal merging the number three carrier Sprint with number four T-Mobile.