| Business | Phone |
| Cartronix Inc 1505 Us Highway 41 # A12, Schererville 46375 | (219) 865-2571 |
| Clarity Wireless & Car Audio 729 Main St, Schererville 46375 | (219) 865-2300 |
| Tri-Corp Wireless Inc 138 Us Highway 41, Schererville 46375 | (219) 322-8150 |
| Tri-Corp Wireless Inc 144 W Us Highway 30, Schererville 46375 | (219) 865-4997 |