AT&T and T-Mobile today confirmed an unlikely partnership for a wonderful cause. The rival carriers are joining forces to fight robocalls and scammers. Both will deliver the FCC-recommended STIR/SHAKEN standards to digitally validate calls across their networks. It will make it easier for customers to filter out unwanted calls. Few things are more frustrating than answering the phone to a shameless scammer. And spam calls are getting more frequent, with 48 billion robocalls made in the U.S. alone last year. It won’t work on iPhone … yet T-Mobile says. Starting today, 12 devices from Samsung and LG will support the new feature, but T-Mobile promises that more will be compatible “in the near future.” It also plans to verify more numbers over time.