Carl's wife is going to the Philippines soon and he wants to know the best way to stay in touch internationally. Leo says that the real answer is WiFi. She'll be able to make calls or even video conference via Skype, Facebook, or WhatsApp. If she uses WiFi, it won't cost her anything. She should just make sure to turn off data roaming on her phone. She can also use Google Maps and preload map data so that she's not using data while getting around.
If she wants to have data, she can buy a basic international package, or a local sim for the phone. Check out prepaidwithdata.wikia.com for details.
She can also rent or buy a MiFi device, and that will allow her to have local cellular data across multiple devices.