The Twilio Voice SDK for iOS currently supports devices running iOS 11.0 or later. For full details, see Voice iOS SDK.
What Devices are Compatible with the Twilio Voice SDK for iOS?
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To Check Your Number Registration Status: Go to your Phone Numbers in the Twilio Console, then Manage > Active Numbers. For additional guidance, visit our Troubleshooting article.
The Twilio Voice SDK for iOS currently supports devices running iOS 11.0 or later. For full details, see Voice iOS SDK.