correct me if i'm wrong but there's really nothing u can do about signal strength except find an area above ground preferably outside a building. Also make sure not to touch or cover the antenna stub while talking. I remember that being a big issue with my previous phone, the Nokia 3300. That'll all I can really say. Also if you're finding this problem at home the best solution is to get a bluetooth headset and leave the phone in the area where it gets the most reception.
Hope this helps
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