I want to use always my mobile internet although I am connected to the wifi network. So I want to make my connection static.
OS: OO 3.1
Phone: Oneplus 2
Related thread: here
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From the linked post your WiFi is not good enough, so combining WiFi and mobile data may work
Speedify claims to do this ( not tried by me)
Combine your Wi-Fi and Mobile Data Connections for Fast Unbreakable Connectivity