Full Specs: * Network. Specifications. Technology: GSM / CDMA / HSPA / LTE. 2G bands: GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2, How did you decide whether to go with CN rom or Global rom?
Flashing firmware modifies core system partitions. To prevent bricking your device, complete this checklist: Oppo A7n Global Rom Extra Quality
If the flashing goes wrong, you risk losing your IMEI and baseband (the "Invalid IMEI" error), which turns the phone into a Wi-Fi-only tablet. OTA Updates: Full Specs: * Network
The hardware of the Oppo A7n is designed to balance efficiency and performance for everyday tasks: Oppo A7n Technical Specifications | IMEI.org Oppo A7n Global Rom Extra Quality
Huawei Honor 8X vs Oppo A7n: What is the difference? - Versus