Making international calls is different from traditional local calls. To call friends and family in Peru, you will need to dial your current country code, then the Peru country code, Local area code in Peru, and then the phone number you wish to reach.
For example, if you are making a call from the United States to Peru and you want to call someone in Peru with the phone number 08035555555;
You will dial thus : 011-51-8035555555, where 011 represents the United States country exit code, 51 is the Peru Country code and 8035555555 is the number you are trying to reach in Peru. Alternatively, you can replace the country exit code (011) with (+), so you can just dial +518035555555.