Phone signal too weak

[featips]

Hello,

I installed Juicy 7 Kitchen on my Sprint Touch Pro. I found the cell phone signal bars is much less than what I previously have. Do I need to install the so-called 'radio'? I saw lots of 'radio' post flying here, but.......can not figure out how to do it.

Shall I install radio? In addition to consider carrier and model, anything elsi when choosing radio? Thanks.