"A low-cost accessibility tool entirely dependent on internet service and federal program eligibility."
The 'real-time captions' are delivered via an internet service that transcribes your phone calls. This service is free to eligible users not because of the phone's manufacturer, but because it is subsidized by a federal fund you must qualify for.
This is for individuals with certified hearing loss who require transcription, not just amplification, and already have stable internet and landline service. The low hardware price makes it an accessible entry point to captioning technology for its specific, intended user.
Anyone without reliable high-speed internet will find this device unusable during outages. Users who only need volume can get a simpler, non-internet-dependent amplified phone for less. Those who prefer a mobile solution should look at captioning apps for smartphones.