Why can't callers hear me from my Doro 8030?

My mother in law has had this phone only 2 months, today suddenly nobody can hear her talking.  I'm not local so can't go and look, any ideas what it could be that I could explain over the phone or text to her?

Hi Heather. Check if your mic is blocked with any particle or your case (if you're using one). Also consider the quality of call, check if both callers have good network signal. Check your screen, maybe you accidentally muted your mic.

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