Please contact us to buy the following 5G cell phone signal boosters. Professional installation by certified installers required. Pre-approval from respective Carrier required prior to installation. If you're a certified professional installer or dealer, please register at https://dealer.signalbooster.com in order to be able to purchase it and download pre-approval agreement you can send to T-Mobile for approval. If you're an end-user, please request professional installation service by providing location and other details requested.