Default Two issues: Poor 3G signal and poor sound quality on video recording

Hello everyone. I am facing poor 3G reception on my xperia z1 especially when i am on the move. I have to select the 3G network manually everytime i am on the movie. And I am able to select it manually which.means that theres no issue with my network. I have kept network setting on automatic. Please help.

Also i am not too happy with the sound quality of video recording. Whenever i record any party videos in a pub the sound quality turns out to be very harsh
My wife's Xperia SP delivers much better sound qualiyy.