APN settings are incorrect or your prepaid balance is exhausted. Fix: Re-enter APN as airtelgprs.com (all lowercase, no http, no spaces). Also recharge with a valid 4G data plan.
With this guide, your trusty Airtel 4G dongle and Windows 7 PC will keep you online for years to come—no expensive upgrades required. airtel 4g dongle software download for windows 7
Airtel’s 4G USB dongles (models like the Huawei E3372, E303, or ZTE MF833) do not function like plug-and-play flash drives. They require two critical components: APN settings are incorrect or your prepaid balance