You can use Retell numbers to call US and international numbers. Below is the list of supported countries along with their respective rates. Retell also offers international numbers. See here for more details.
1

Twilio

🌍 Country💬 Rate/Min
🇺🇸 US$0.015
🇺🇸 US (Toll-Free)$0.06
🇮🇳 India$0.15
🇦🇺 Australia$0.10
🇩🇪 Germany$0.10
🇪🇸 Spain$0.10
🇬🇧 UK$0.10
🇲🇽 Mexico$0.05
🇫🇷 France$0.06
🇯🇵 Japan$0.28
🇨🇦 Canada$0.03
🇮🇹 Italy$0.06
🇮🇩 Indonesia$0.40
🇵🇭 Philippines$0.80
🇲🇾 Malaysia$0.20
🇹🇭 Thailand$0.45
2

Telnyx

🌍 Country💬 Rate/Min
🇺🇸 US$0.015
🇮🇳 India$0.25
🇨🇦 Canada$0.03