There are many plausible answers to this question. If you discover that your phone is not working properly within 15 days of obtaining it from AirTalk Wireless, you can return it for a full refund. If you return the device to the company in functional order without physical damage or signs of use, you will receive either a full refund or a replacement.
However, if the phone is broken after this time period due to your fault, you will have to get it repaired at your own expense at the company. However, considering you got the phone for free from government aid, you can ask for a discount after providing the relevant documents.