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To Measure 3G or 2G signal

I'm not sure it works on every android phone but if you open up the dialer and type *#*#4636#*#* you get at some extra debugging info and you can view your signal strength in the phone information section as both DB and asu.

Edit: it also displays the type of network your connected to e.g. hsdpa or GSM. And neighbouring cells aswell.
 
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