we are using a device that uses the Nordic NRF 9160. We want to use the device on the Verizon or AT&T network in the US but both providers tell us that the device isn't approved with them. Neither AT&T nor Verizon will acknowledge the NRF 9160 as a certified device. Can you tell me if there are any device manufacturers using the NRF 9160 that are certified for use on Verizon or AT&T? We are ready to go... just can't buy the cellular service.