I just bought a new Android Phone called The RedMi Note 8T it has Android 9 and shows me two new option VoLTE and WiFi Calling - will they work with TalkTalk Mobile which appears to be using Vodafone?
TalkTalk Mobile does not support either VoLTE or Wi-Fi Calling.
But as a TalkTalk customer you're going to get preferential deals with TalkTalk's partner O2 and with your O2 account you are eligible to set up voice calls over 4G or Wi-Fi.
O2 Mobile offer
Cancel your TalkTalk Mobile service
Wi-Fi Calling - TalkTalk Help & Support
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