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1. Get Carrier Aggregation combinations from your device

There is many way to get Carrier Aggregation combinations from devices. Here are instructions for mobile phones.

Qualcomm diag

Scat (Qualcomm and Exynos)

Network Signal Guru (Qualcomm, Exynos and Kirin, paid plan required)

Cellular Pro (Qualcomm only, paid plan required)

OnePlus, Oppo and Realme

Vivo Devices

Xiaomi devices (Qualcomm only)

LG devices (Qualcomm only)

Nokia devices (Qualcomm only)

Samsung Devices

Apple iOS

Mediatek Devices

Shannon Devices

Airscreen