the country code for brazil is 55 - the city code for rio de janeiro is 21 - the local landline phone numbers normally start with a 2 or 3 - local toll free numbers normally start with 0800 - local cell phone numbers normally start with 7, 8 or 9 and some business numbers are only four digits and start with a 4.

do not dial 55 or 21 if calling a rio number from a telephone in the city - to make collect calls, dial '9090' in front of the number - collect calls are charged at the same rate as regular phone calls, so it costs the same for anyone to receive a collect call as it would cost to dial a number directly. 

should individuals receive a collect call they will be alerted by a short tune and through holding on the call will automatically be accepted - if individuals are looking to call collect, they will have to say their name after the tone which is easy to do.