Marvels and paradises by design only use aids mics for bt calls.
Way around it is to use phone as regularly and use acoustic phone program. If it’s too noisy around you, it probably won’t be a good solution either for you or your partner.
Or use telecoil if your aids support that, directly on the phone, or maybe with neck loop and holding phone in front of you (but you need an app which splits the signal and forces usage of phone mic). Problem here is buzzing from environment which can make calls incomprehensible.
Roger mics won’t work as mics for phone calls on marvel and paradise platforms. They come in two flavors - regular and iN version. Regular has BT and that won’t work with P and Ms. BT from mic kills bt in aids. For aids before M platform it indeed works as a mic, but it also carries whole phone call, since aids aren’t able to connect directly to the bt on the phone.
iN version is made for M and Ps, it does not have a bt, and cannot be used as a mic for calls.
So far, only working option is a cable contraption - use splitter on phone output, to split mic and audio. Use wired mic and a device to get the audio in aids, again, connected by wires.
Device is either tv connector (needs power supply or power bank that is able to continuously give power and not shut off)
Or roger mic that’s used as an audio streamer.
Android phone does not allow splitting the bt call signal and redirecting mic portion to phone built in mic.
However if you plug in telecoil loop, then you can split the signal.
So for phone calls in really loud environments, M and Ps are not suitable.
However, shopping mall type of noise can be successfully resolved by increasing noise block for bt calls, assuming you wear occlusive molds/domes with just a small vents and not open domes.