When travelling to Cambodia from Bahrain, there are a few steps that need to be taken in order to make the call. The first step is to find out the country code for Bahrain, which is +973. The next step is to find out the country code for Cambodia, which is +855. After that, the caller needs to dial the international access code, which is +. Then, they need to dial the country code for Bahrain, followed by the phone number. So, to call a Bahraini number from a Cambodian phone, the caller would dial +973 followed by the phone number.