Dell latitude E5550 WWAN installation Sierra
I got Dell latitude laptop E5550 that has USIM port without WWAN card. So I purchased WWAN card ( DW5809e / EM7305) from aliexpress at 30.15USD. I installed it and windows 10 driver installed automatically. Then I found that Cellular option is activated. So, I unscrewed back cover and installed USIM card (micro not nano USIM). I reboot laptop 3 times to attach LTE. Then it works with SK telecom LTE seamlessly. I am happy now. Enjoy.