Bsnl/cellone mobile phone connection
Poor range

I am facing a low range problem in my house. Before 11 months i am getting strong signal from Pulamon tower, The aerial distance from my home to the tower is around 1km. Now I am getting signal from a tower that is greater than 3 km aerial distance. what to do in this situation.. Now I am using a Reliance CDMA handset with life long connection to receive emergency calls... please advice me...