Making international calls is different from traditional local calls. To call friends and family in Cameroon, you will need to dial your current country code, then the Cameroon country code, Local area code in Cameroon, and then the phone number you wish to reach.
For example, if you are making a call from the United States to Cameroon and you want to call someone in Cameroon with the phone number 08035555555;
You will dial thus : 011-237-8035555555, where 011 represents the United States country exit code, 237 is the Cameroon Country code and 8035555555 is the number you are trying to reach in Cameroon. Alternatively, you can replace the country exit code (011) with (+), so you can just dial +2378035555555.