Paying for cellphone loads

So I bought my friend a new cell phone for her as a graduation present and to help us with communication. She is with the carrier Smart I think and I want to help her out with the loads for the more expensive internet package so we can communicate easier and make it less expensive for her. Anyone know of options for me to purchase loads for her phone? If I have her number can I just make payments directly to the carriers website for it for a month at a time? Any of you Filipinas that can help me out I would appreciate it.