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

๐ŸŒ Country๐Ÿ’ฌ Rate/Min
๐Ÿ‡บ๐Ÿ‡ธ US$0.015
๐Ÿ‡บ๐Ÿ‡ธ US (Toll-Free)$0.06
๐Ÿ‡ฎ๐Ÿ‡ณ India$0.15
๐Ÿ‡ฆ๐Ÿ‡บ Australia$0.10
๐Ÿ‡ฉ๐Ÿ‡ช Germany$0.10
๐Ÿ‡ช๐Ÿ‡ธ Spain$0.10
๐Ÿ‡ฌ๐Ÿ‡ง UK$0.10
๐Ÿ‡ฒ๐Ÿ‡ฝ Mexico$0.05
๐Ÿ‡ซ๐Ÿ‡ท France$0.06
๐Ÿ‡ฏ๐Ÿ‡ต Japan$0.28
๐Ÿ‡จ๐Ÿ‡ฆ Canada$0.03
๐Ÿ‡ฎ๐Ÿ‡น Italy$0.06
๐Ÿ‡ฎ๐Ÿ‡ฉ Indonesia$0.40
๐Ÿ‡ต๐Ÿ‡ญ Philippines$0.80
๐Ÿ‡ฒ๐Ÿ‡พ Malaysia$0.20
๐Ÿ‡น๐Ÿ‡ญ Thailand$0.45
2

Telnyx

๐ŸŒ Country๐Ÿ’ฌ Rate/Min
๐Ÿ‡บ๐Ÿ‡ธ US$0.015
๐Ÿ‡ฎ๐Ÿ‡ณ India$0.25
๐Ÿ‡จ๐Ÿ‡ฆ Canada$0.03