I work at the same corporate site (777 Long Ridge Road, Stamford) as was mentioned in another thread from 1 1/2 years ago. I switched to T-Mobile not 2 weeks ago and noticed, even after the original thread was posted, there is no voice or data available once I enter the site. I can get data through our corporate WiFi but it looks like Wifi calling is blocked. So no voice reception at all. I have to rely on my ATT business cell for mobile coverage when onsite. I don't understand how this situation has persisted where AT&T and Verizon have strong signals here. This is a 3 office building site and a corporate headquarters. Lots of potential customers for T-Mobile and other existing customers like myself who are dead in the water contemplating returning to ATT. Can T-Mobile arrange for roaming on ATT in this part of Stamford? Can't something be done?