Re-looking again using Sensorly maps it looks like Sprint has some 4G coverage just south of your Town) I would check and see if there is a Sprint Corporate Store or Maybe a US Cellular store in Columbia)  Now as an alternative option you still have Verizon 3G it's not the speeds as 4G but you could if you have a way to use Wi-Fi could use Wi-Fi at your home and if you work in Columbia have the 4G speeds on your phone while working there..