The best app for cold calling?

Hey guys, can you recommend me any app what is best for cold calling? Because when you call from skype, i believe, a call receiver gets a call from “not known” (private) phone number, right? so i doubt that skype is the best choice.

im from Europe, but i think i would be mostly calling USA and other countries in Europe or abroad for my instagram growth service.

could anyone suggest me what program should i use? i tried wih skype a bit, but its costly and once again, im not sure if calling from skype is professional.

thank you and let me know guys!

if you’re new to calling don’t worry about what you’re using to call or whether it looks professional or not, just get on the phone - you can buy numbers and turn off private so those numbers are your caller idwhen calling via skype