For neckband: When your headset is connected to your phone, press the multi-function button four times continuously to find your phone. Your phone will then start to ring.
For TWS earbuds: When your headset is connected to your phone, click on touch side area of left or right bud for four times continuously to find your phone. Your phone will then start to ring.
Neckband supported models:
realme Buds Wireless 5 ANC, realme Buds Wireless 3
TWS supported models:
realme Buds Air 7, realme Buds Air 7 Pro, realme Buds Air 8
Setting path:
realme Link > Click the earbuds card > Find my phone.