16. The computer system as recited in claim 12 , further comprising, based on the phone call being with the captioned telephone service user: influencing a dialing sequence of the mobile phone to give preference for transporting high-fidelity audio as part of the phone call.
12. A computer system comprising a mobile phone, the computer system comprising: one or more hardware processors; one or more audio capture devices; and one or more non-transitory computer-readable media having stored thereon computer-executable instructions that are structured such that, when the computer-executable instructions are executed by the one or more hardware processors, the computer system intercepts a calling sequence, including at least the following: detecting that the mobile phone is to participate in a phone call; determining that the phone call is with a captioned telephone service user; based on the phone call being with the captioned telephone service user, capturing, at the one or more audio capture devices, a high-fidelity recording of a user's voice, wherein the high-fidelity recording comprises audio of a frequency range greater than 300 Hz to 3.4 kHz; sending speech data to an adaptive captioning service based on the high-fidelity recording; capturing, at the one or more audio capture devices, a low-fidelity recording of the user's voice in parallel with capturing the high-fidelity recording of the user's voice; and sending the low-fidelity recording over a first network connection, while sending the high-fidelity recording over a second network connection.