Frankly, recording with 24bit depth is a waste of space if a mobile phone is within half a meter of the recording equipment, let alone if it is the recording equipment.
Your phones uses high powered bursts of pulsed RF to talk to the next cell tower (which will tend to be at some distance) regularly. Do yourself a favor and get some more dedicated recording equipment.
As a rule of thumb: built-in electret condensor mic capsules of the kind that fit within phones or handheld recorders have enough of a relevant noise floor that recording with more than 16bit resolution is nonsensical. You can fill in the 8 additional bits of resolution with a good random number generator afterwards for equivalent results.
The preamps and mics necessary to warrant going to more than 16bit have power and space requirements incompatible with a mobile phone.
Given how popular requests for 96/24 on clearly unsuitable recording equipment are, I have little doubt that we'll be seeing a marketing push to 192/32 bit recording soonish and 384/48 bit next. Flash memory producers will love it.