Testing synchronous incoming call in TeleGuard secure messenger with its unique original ringtone on my Samsung Galaxy S10, S20 Fan Edition, S21 Plus, S21 Ultra, S8, S9 Plus, A52 & A72 phones at the same time.

Enjoy the stereo sound!

Samsung S8 runs Android 9 with One UI 1.0, Samsung S9+ runs Android 10 with One UI 2.5, the rest of devices run One UI 3.1 on top of Android 11.

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