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Force sound over 3.5mm jack and video over HDMI

For Raspberry Pi 4, an update to @rajesh6115's answer: use rasp-config to force sound in 3.5 jack. To do so use below commannd sudo raspi-config and then select 1 System Options Configure ...
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Connecting the pi to a phone using a RJ11 cable to send and receive audio

While a USB modem like that would give you the ability to interface between your RPI and a phone network, it's set up as a client and so won't generate enough power output onto the RJ11 cable to ...
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