If you use iTourTranslator to make a phone call, artificial intelligence will automatically translate the call. The other party can be a landline phone. He/she will hear voice of his/her language. When he/she speak a foreign language, you will get two language subtitles on the screen of your cell phone. You can also have automatic translation when answering the phone, but you need to buy a phone number in the APP. If you feel that machine translation is not accurate enough, you can also call a human interpreter to help you over the phone.。