Depending on the setup in the car, you could be using a microphone in the car or one in the phone to transmit your voice signal.
Since your husband's phone works OK this sort of eliminates the car mic option
Is the phone in a protective case at all?
If so remove it from the case and check if your voice is heard OK.
Does the same problem occur when using the phone in loudspeaker mode when on a normal type phone call i.e. not BT?
If so check that the voice inlet hole located at the top edge of the phone is not blocked etc. Try using a vacuum cleaner to remove any possible obstruction from the voice inlet hole. Do not use a pin or probe to try and clear it as the microphone is located directly behind the hole and could be damaged.
OK check that the microphone voice inlet hole at the top edge of the phone is not blocked etc - see what I suggested to try in the answer above.
Here's an image that shows where the voice inlet hole for the microphone that is used for loudspeaker calls etc is located. The microphone located at the bottom of the phone is used for "normal" mode calls i.e. phone held close to ear - no sound from loudspeaker at bottom of phone, sound is from the speaker at the top of the phone which would be near to the ear.
(click on image).
If still no good the phone will have to be opened and the microphone connection checked or the microphone may have to be replaced.
If clearing the voice inlet hole with a vacuum cleaner didn't resolve the problem since it appears that the phone is <1 year old it should be covered by the manufacturer's warranty.
Get it repaired using the warranty provisions
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