Poor Signal strength 78701

Hello, the signal strength inside the building as you get to the higher floors has of late become very poor in downtown Austin, TX. I understand that since this is inside a building you cannot control this (I disagree), but this is the heart of downtown - all buildings are high and if all customers are unsatisfied or not receving calls/texts - people may start moving service providers. Hope you can add additional towers/antennas around urban highrises to increase signal strength. Hope you seriously consider this.
Thank you