Applicable for all realme smartphones that support VoLTE function.
You can make wideband, high-quality phone calls with VoLTE on some models. To make these calls, both phones need to work with VoLTE.
1. Your location, your account with your carrier, and the model of your phone.
2. The carrier, carrier account, location, and phone model of the person you're calling.
3. Some carriers support VoLTE only in certain cities or area codes. Contact your carrier to ask about your area and account.
You can check Carrier support and features for realme smartphone to see if your carrier supports VoLTE.
Some carriers turn on this feature by default. To enable VoLTE on ColorOS 5.2, go to [Settings]>[Call]> [Enable the VoLTE voice call function]. HD will appear on the status bar once VoLTE voice call function is enabled. For ColorOS 5.2 and later, go to [Settings] > [Dual SIM & Cellular], select one SIM card and enable [VoLTE Calls].
*If your device does not support VoLTE, [Enable the VoLTE voice call function]/[VoLTE Calls] option won't be shown.
When you try to turn on VoLTE, you might see a message that says "Cannot Activate LTE Calls. To enable LTE Calls on this account, contact your carrier." This can happen with some account types, including business lines, and on some carriers. Please contact your carrier for help.
You might see a message that says to insert a new SIM card. This can happen with older SIM cards, or a micro-SIM card that's cut down to the size of a nano-SIM card. You might need a new SIM card to use VoLTE. Contact your carrier.
If calls drop frequently or call quality is poor when using VoLTE, try turning off VoLTE. If calls improve with VoLTE turned off, get help from your carrier. To turn off VoLTE on ColorOS 5.2, go to [Settings] > [Call] > [Enable the VoLTE voice call function] and turn it off. Or on ColorOS 5.2 and later, go to [Settings] > [Dual SIM & Cellular], select the SIM card and turn off [VoLTE Calls].
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