You need to get an EP06-E module. It supports Band 28. Learn more: https://www.quectel.com/wp-content/uploads/pdfupload/Quectel_EP06_Series_LTE-A_Specification_V1.7.pdf
We are selling XE300C6 with EP06-E: Puli (GL-XE300) Portable IoT Gateway | 4G LTE | OpenWrt | 5000mAh Battery– GL.iNet If you are interested in getting a module and replace it yourself, you can visit our store: Quectel 4G LTE Module– GL.iNet