Brazil's area code is +55, the phone numbers in Fortaleza start with +55 85.
Brazil has many cell phone operators, the most common ones being Claro, Oi, TIM, Vivo that work with normal GSM/ UMTS phones.
Check with your phone company how much roaming costs. The prices range from free (T-Mobile US customers) to incredible (most others).
One option is to buy a local prepaid card, another one to get an international SIM card, for example ChatSim, which for $10 per month allows WhatsApp-Texting (no voice messages or attachments or location or web browsing).
