Going to Costa Rica with my Samsung 3 phone. Want to purchase the International add-on for texting. Does anyone know if "Koodo roaming partner service is available" there, before I purchase an add-on? The "nitty gritty" info on the add-on page says it will only work if partner service is available. (in other words: will a purchased Koodo international add-on work there? Also when there, to call Canada do I have to dial 1+country code+area code first? And if Canadians calling me in Costa Rica on my Canadian number, do they have to dial 1+Costa Rica or Canada country code first?