Ao is a 21-year-old migrant worker from Burma living in Phuket, Thailand. He bought 30 mobile phone top-up cards which are split into two categories: reasons why there are many Burmese workers in Phuket, and how Burmese workers get money back to their families in Burma. The document implies that Ao bought the cards to send money back to his family still living in Burma, as migrant workers in Thailand often send earnings to support relatives in their home country.