Does that model have a second mic in the back for noise cancelling? Wonder if they ended up too close to eachother. More likely, the mic is not positioned correctly over the little hole in the bottom of the phone. Check the mic hole to see if it is clogged then maybe (if you can do this safely) test it with the front of the case off.
If talking directly into the mic outside the case still does not work, it may be a bad mic. There also may be a way in the software to increase mic gain.
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