Because they were sold as loss leaders on the assumption that people would be paying for time/data on the network.
"Customers can get a WizPhone WP006 from vending machines at more than 10,000 Alfamart stores for just USD$7 (IDR99,000)1. Then, with the built-in AllWizapp, customers can unlock shopping benefits in Alfamart by scanning barcodes on each product and making their purchase directly via the app on their WizPhone."