How to check network or Signal strength in Android?

Checking the signal or network strength is quite necessary when you want to take a new connection or a postpaid connection

A mobile phone signal (or reception) is the signal strength (measured in dBm) received by the mobile phone from the cellular network (on the down link). Arbitrary Strength Unit (ASU) is an integer value proportional to the received signal strength measured by the mobile phone.

The dBm strength standards are

-105 to -100 = Bad/drop call
-99 to -90 = Getting bad/signal may break up
-89 to -80 = OK/shouldn't have problems, but maybe
-79 to -65 = Good
Over -65 = Excellent

So the lower the signal the better the strength

Now to check the signal strength in your android phone, find the below

Settings >> About Phone >> Status >> Signal Strength

(Try googling for more deeper info)