OnePlus
Enable or Disable Wi-Fi Calling auf OnePlus
Wi-Fi calling sends your voice call data over a connected wireless network instead of the mobile antenna. That matters in basements, thick-walled buildings, or rural spots where carrier bars are low but Wi-Fi is stable.
The feature depends on two things: your provider must support and activate it for your specific plan, and your OnePlus needs the setting switched on for the correct SIM. If either piece is missing, the option stays hidden or disabled even though the phone itself supports it.
Where to find the toggle
Go to Open the Settings ➔ Tap on Wi-Fi & network ➔ Tap on SIM & network ➔ Choose a SIM card (Dual SIM) ➔ Enable or disable Wi-Fi Calling.
On a Dual-SIM device, each SIM has its own switch. Enabling it on one slot does not activate it on the other, so check both if you swap SIMs regularly.
If the toggle refuses to switch on, contact your carrier first. Some providers require a specific tariff, an app activation, or a manual unlock on their end before the phone will show the option as available.