T-Mobile made an “Un-Carrier Amped” announcement on June 25, when it announced that T-Mobile JUMP! subscribers can now upgrade their phone up to three times a year. Now the carrier has another announcement to make.

The company said that it will announce something new tomorrow at 9 a.m. Eastern, when CEO John Legere and chief operating officer Mike Sievert will host a media phone call. The two will “share how they continue to rewrite the rules of wireless by amping up their signature Un-carrier moves,” T-Mobile said, noting that the announcement should be “industry rattling.”