How to determine carrier Cell signal strengths ?

[kramer5150]

Is there a way to measure/determine signal strengths from all the various carriers? I know what the big red map, the big blue map and even the pink one looks like, but thats not accurate enough for me.

Is there an unbiased www site / utility that provides this data?

 

[Almeuit]

I'd check out sensorly.com and also Root Metrics.