No, dialing a '1' first is not necessary when making an outbound call with Unitel Voice.
You can place your call using:
- The 10-digit format (e.g., 630-579-0058)
- The 11-digit format with '1' (e.g., 1-630-579-0058)
Both formats will work seamlessly, so use whichever you prefer or are accustomed to.