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By default, calls are made over the 2G or 3G network, depending on reception. After enabling VoLTE (Voice over LTE) on the Android smartphone, calls are made over the 4G data network, which improves voice quality, speeds up call setup and reduces battery consumption.

Android 12
Step 1: Tap on  Settings
Step 2: Tap on  Network and Internet
Step 3: Tap on  Internet
Step 4: Tap on  Settings
Step 5: Enable or disable  4G Calling
  1. Tap on Settings
  2. Tap on Network and Internet
  3. Tap on Internet
  4. Tap on Settings
  5. Enable or disable 4G Calling
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Android Instructions
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