Signal strength

I like Smarty very much,  a great app, tells me all I need to know,  very impressed.  But the signal strength is a big let down. I may need to investigate alternative providers.  If only Three.com had plans to either increase the height of my nearest mast or somehow increase the strength.  I wish they would publish a list of upgrades to cell masts. It's a shame, I do not want to leave.