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 just told TechnoBuffalo 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."

We don't know what else to expect from the call, but we'll be back with all of the news tomorrow morning.